lathe dc motor conversion

Using the ‘low’ gear setting the range was up to 1000rpm, with the expected increase in torque. Setting Up My HF 9x20 Lathe With A Variable Speed DC Motor 12-13-2004 Ed Kadlec . There are several other useful functions, that won’t affect how the motor runs, but may still be useful. by Torch » Mon Apr 27, 2015 5:58 pm, Post Second, there is a lot of bang for the buck. A quick check, and the old single-phase motor was found to run as smooth as silk. Go for it. by LX Kid » Mon Apr 27, 2015 9:24 am, Post F15 (maximum frequency limit) works like F03, but only applies to speeds set using a potentiometer. Initially it was limited to 50.00 Hz maximum, but I soon changed this to gain a wider speed range, up to 65 Hz. by Torch » Mon Apr 27, 2015 8:03 pm, Post Having made a nice neat job of these connections, I double checked them all, and replaced the main circuit terminal block cover. It took me some time to source a replacement motor, and when I got it I treated it a little more gently. The new motor at 24v, 10A= 240w, so that would be equivalent power. If you have along run of wire, as may be the case with remotely controlled machinery, a control voltage may drop considerably due to resistance of the wires. Use our magazine locator links to find your nearest stockist! The motor was supplied wired in Y configuration (for a standard 415V 3-phase supply), and needed to be rewired to delta to run off the 240V drive. In principle you can program the inverter when the motor is running; I’m not sure this would be a wise approach. Then find a suitable controller. I show how I converted my South Bend lathe from an AC motor over to a DC motor. This is not essential, and with bigger, heavily braked, motors its can cause overvoltage tripping, but it is needed for some of the very advanced motor features (which I will not describe). Photo 9: The new motor mounted on the back of the lathe. The potentiometer should allow you to vary the output frequency, and hence the speed of the motor. I think 650 is too fast for bowls but is fine for smaller things. The design of a mini lathe makes it almost impossible to devise a direct drive to the lathe spindle, however, this problem was easily overcome by replacing the motor with a countershaft. The up and down arrows can be used to select the other options 1E_ _, 1C_ _ and so on. Other inverters may have different systems, but the general principle of programming by entering a series of parameters seems to apply to most inverters. In principle, a sound crimp will actually create minute cold welds between the connector and the wire, and should be as secure as a soldered joint, but less liable to fatigue failure. This kit will convert any of the following single speed lathes to variable speed: PSI Turncrafter #TCLC10, PSI #KWL-1018, Rockler ™ Excelsior #33207, Harbor Frieght™ #65345, Shop Fox™ #W1752, Jet™ #1015, Rikon™ #70-105, Delta™ #46-455, Grizzly™ #H8259. To complete the conversion, I dismantled my pendant and fitted a more sophisticated set of controls in the lathe’s original control box (photo 10). I asked about moving up to a larger motor, but Their advice was that a similarly rated 370 W (0.4 HP) 3-phase system would, in practice, give much better performance than the single phase 1/3HP motor because of the steadier application of power. The inverter manual starts with eleven pages of safety warnings. The HP rating is too approximate and prone to exaggeration by some manufacturers. My wiring diagram is shown in figure 1, together with a basic parts list in Table 2. Despite these minor annoyances, by carefully remembering to drip a little oil in the cups each time I used the motor, it gave me good service without a single hiccough. Had one on my 7x lathe while it's controller was being repaired. You can control the inverter from its built in control panel, but the controls are small and, unlike consumer goods, it is easy to remove the front panel and access live wires. Finally I took the voltage input (terminal 12) from the wiper of the pot. 3-Phase Conversion and Other Alternative Methods of Powering a Mini-Lathe. If you have purchased the motor and inverter as a matched pair, you should not need to change these settings. In this new arrangement the motor is secured to a welded up frame from 19mm square steel tube pivoting on a bracket held in place using the screw holes for the old motor cover, Connecting the Inverter to the motor and the mains supply, Remote control of starting and motor direction. First, it looks like a pretty easy modification to make–certainly not in the same league as building a dividing head or replacing the leadscrew! Together with the ‘high/low’ gear change built into the lathe, this gave me ten speeds (two were effectively duplicated) between 140 and 1100 rpm. 350(w)/261.8(rad/s) = 1.34(Nm). Preferably the one that is currently installed in the treadmill, if possible and money is tight. Others are tied up with industries need for quality control and process monitoring – for example reporting on the lifetimes of various components, or how long a cooling fan has been running. To exit without changing the data, press PRG/RESET. It uses default values based on the motor specification, and I am cautious of changing these settings in the absence of detail information on things like motor thermal constants. 4.5 out of 5 stars 71. When speed is set at 0 the motor enters jog mode and can be advanced using the start button for tapping etc. The power terminals should be connected using crimped on slotted-spade connectors, with insulated boots. These are SIEG C2 and C3 lathes. One sold in the EU will typically assume that it will control a 50Hz motor, with the same rating as the inverter. You will notice that the readout does not show the motor speed, but the inverter frequency. Interestingly, I found that despite the nominal power of the old motor (photo 6) being nominally the same as the original DC motor, I found that in practice it was more powerful. The truly obsessed will go beyond this brief introduction and start playing with things like torque boost and thermal constants. My inverter produces a 240V 3-phase output. Most crimping failures are due to insufficient force being used, so the welds do not form and the cable is not securely clamped. A steel bar, tensioned by a screw with a tommy bar, runs to the base of the lathe allowing the belt to be kept tight or loosened for pulley changes. For subscription issues please see THIS LINK. Connected a lever style throttle cable to the motor speed control arm and bolted the lever to … A little more effort allows the controls to be located on a remote pendant, or a machine mounted control panel, and for built in stop switches and brake switches to be wired in as well. All programming was done in the same way. If such a switch is used then the hold function is not required. The meter should be connected between the terminals FMA and 11 (analogue common), the latter as used for the ‘low side’ of the speed potentiometer. Emergency Stop - cuts all power to the motor immediately. To perform the DC-DC conversion, I utilized a totem pole topology with two N-type-MOSFETS driven by a MOSFET Driver with High and Low Side outputs. Pressing PRG/RESET again will take you back to running mode. The technique is to strip a short section of wire, as long as the tubular section of the crimp (5mm or 8mm). My Clarke CL300M mini-lathe was my first lathe (photo 1). Please click here, Sign up to our Newsletters The programming for the inverter described below reflects this new arrangement. 24V (PLC) runs to the normally closed (N/C) stop switch. This is intended for applications like remote pumps and must NOT be used with machine tools for obvious reasons. by Torch » Mon Apr 27, 2015 11:18 am, Post A chain is only as strong as the weakest link, right? FREE Shipping by Amazon . This is the whole story. This approach has the advantage of retaining the 2:1 reduction provided by the existing toothed belt drive from the motor to the spindle and the high/low gearbox in the headstock. As is usual with modern motors this is somewhat smaller than the old Hoover motor. And the power factor of the DC voltages always remains 1. I was able to bodge a repair and give it a semblance of life, although low speed running suffered. matt October 20, 2017 336 0. 4.2 out of 5 stars 10. For the relay, a use might be to light a warning indicator as an overload early warning. Enco 9x20 DC Motor Conversion I bought one of these for a DC motor conversion on my lathe a few years back: t is a 3/4hp/550w commercial sewing machine motor found on Ebay. This would let me get the absolute best out of the lathe, particularly as the constant-torque characteristic of a VFD drive would be ideal for low-speed work. I have to suggest you read and understand all such information, and although I have extracted a few key points below, they are not a substitute for the manual. One advantage of an inverter is that it will reduce its output and try to keep things going, rather than just cutting out if you overload it. Convert a lathe to variable speed drive for under $100. Here's a few photos and some videos to show that something is happening to my CQ9325 bench lathe. This means the dual voltage 240V/450V motor had to be connected in delta mode as described earlier. Photo 13: The inverter specification plate. The new motor runs at 3576rpm @ 24v from the 149Kv quoted. FWD – OFF – REV – hopefully self explanatory! A steel base has two thick aluminium alloy end plates secured to it with countersunk screws; the end plates are bored for ball races in which runs a good sturdy shaft. Eventually you might want to step up to one of these. Be nice not to have to mess with the belt changes. I would suggest the latter, for simplicity and flexibility, noting that the inverters rated demand is less than six amps from the supply. A site dedicated to enthusiasts of all skill levels and disciplines of the metalworking hobby. by LX Kid » Mon Apr 27, 2015 10:56 am, Post 31. After considerable thought, I decided to change to direct drive to the spindle, and mounting the motor on the back of the lathe bed. I could now test the motor and inverter, using the controls on the front of the inverter. Table 1: Speeds available using belts and pulleys. Believe me the inverter can stop small motors without such aid very effectively! Photo 7: The poly-v pulley fitted to the motor. This sets the ‘hold function’ and keeps the motor running when the momentary start signal is disconnected from FWD or REV as long as X1 is disconnected from PLC. Saving money and time What I really liked about the remake of the controller is easy wiring! If you just want to check the data in the inverter and avoid editing it by mistake, you can go through the menu 1 function code letters, to menu 2. The line (live) and neutral from the mains supply I connected to the L1/L and L2/N terminals, respectively. DC motors used to be the go-to for anyone looking to an EV conversion, but I would strongly urge everyone to stay away from a DC conversion unless they are building this car for purely 1/8 or 1/4 mile drag racing. Plug the cord into the power and connect the female end to the power cord of your lathe. Of course I will contact them and ask questions but just thought someone might know. The low voltage terminals used for the control circuitry use high-quality clamp terminals that can be used with bare ended wires, although if you can get very fine crimp ferrules you can use them. The inverter display is set to show current consumption, and a separate tachometer shows spindle speed. This meant learning how to program the inverter and making and wiring up a remote control box. The control circuitry runs off two separate power supplies. Good luck, observe the safety warnings and precautions, take one step at a time and enjoy being able to have a power system for your machinery that exactly meets your needs. Speed 0-10 – sets the frequency of the inverter and hence motor speed. There are two grounding terminals, marked ‘G’. LATHE CONVERSION DC MTR: HANDLE TUTORIAL: CARBIDE TUTORIAL: SCREW CHUCKING TUTORIAL: Ornaments for Christmas: VARIOUS SHOP STUFF: Favorite Links: Contact Me : CONVERTED AC TO VS DC 110V. Therefore, the connection is quick and accurate. The other control signals use the separate 24V system. So, my lathe looks a bit worse for wear as the following photos show: STRIP DOWN. In this new arrangement the motor is secured to a welded up frame from 19mm square steel tube pivoting on a bracket held in place using the screw holes for the old motor cover (photo 9). Only valid values for the parameter in question can be changed, and you can use the up and down arrows or the potentiometer to do this. A normal v-belt would have worked better, but when I converted my milling machine to belt drive, I used a poly-v belt for simplicity, compactness and quiet running, and found it highly satisfactory on all three counts. To convert the model to a model that is compatible for conversion with Simscape HDL Workflow Advisor: 1. BEFORE REFURB. This lathe conversion travel kit replaces the saddle and the cross slide feed screw, and it includes a spacer for the longer screw. The inverter I was recommended is an IMO Jaguar CUB3A-1 (photo 12). I have chosen 65Hz for the time being, however, I will probably raise it further as my confidence grows. Pressing the FUNC/DATA key while running switches the display between frequency, amps, volts and power. These can be used to control a transistor switch or a changeover relay. In contrast, the transistor switch can be used for regular ones. 95. I built a no-voltage switch arrangement, and fitted it inside the existing lathe control box. The speed ramped up and down gently over the default six seconds. If this is done the inverter will use this voltage, instead of following variation in the supply voltage. In my case, the inverter was supplied configured so that they had to be connected or disconnected from PLC (+24V), although the manual assumes the default is CM (0V). Lathe Modification: Variable Speed Treadmill DC Motor. However, I was more familiar with the mechanical capabilities of my lathe, and I wasn’t very keen to keep fitting motors that wouldn’t let me use it near its limits. The manual takes many pages to cover the various menus, but the following is a summary of the key points. After much experimentation with different ways of powering my mini-lathe on a keep it going basis, I finally decided to go the whole hog and install an inverter and 3-phase motor – to give me variable frequency drive. Century formerly AO Smith GF2054 1/2 hp, 1725 RPM, 115 volts, 48/56 Frame, ODP, Sleeve Bearing Belt Drive Blower Motor. F07 (acceleration time) and F08 (deceleration time) are self-evident, you may feel the default 6.00 seconds is to long. If your switches are of the normally open type, you will need to program E03 to 7 to reverse the logic on the input. This arrangement was only meant as a stop-gap, but to my surprise I found it easy to use and did not miss variable speed – just the lack of a really low speed. If you program E48 to 4 you can get the monitor to display load shaft speed. $99.95 $ 99. The jumper bar between P1 and P1(+) must NOT be removed as we are not using such devices. The countershaft pulleys had overall diameters of 3 1/4, 2 1/4 and 1 5/8 inches. $26.88 $ 26. FREE Shipping by Amazon #2MT Professional Pen Turning Mandrel and Professional Barrel Trimmer Kit. I really wanted to convert our wood lathe to variable speed because there’s a lot of advantages to doing so. I saw that a new version, with a bigger, more robust, brushless motor was available, but the new motor won’t fit the old style lathes. If this all sounds long winded, it probably is, but it does allow you to programme a many parameters with only four buttons and three menu levels. Single pole toggle switch on-off-on (Forward-Stop-Reverse), Large double-pole push button normally closed (Emergency Stop switch), Single-pole push button normally open (Start switch), Single-pole push button normally open (Stop switch), 0-1v moving iron meter (adjusted to 0-10V with series resistor). I wanted something that was a bit more professional. These are not a step by step instructions to using an inverter, it is a resume of what I did to set up and use my inverter and is intended only as guide to what to expect and consider if you choose to do the same. Bolt your lathe down to the floor, and definitely wear a face shield to protect yourself. Some machine tools do not use a start switch, just a three-position switch that selects forward, reverse or stop. I think the motor pulleys were about the same as the two smaller motor pulleys, but I have either lost or ‘recycled’ them. If your motor is rated for 60Hz, take advantage of this and get the widest possible constant torque range. I looked at the KB electronics PWM's and I don't see any compatible for a 1.25hp motor at 115v line voltage. I wired analogue common (terminal 11) to the anti-clockwise end of the potentiometer track (so 0v is the ‘off’ setting). On the other hand, if a control current is put into a long wire loop, the same current will flow along the entire length of the loop regardless of its resistance. This can be used to send an analogue signal to terminal FMA (analogue monitor) of between 0V to 10V, in line with various parameters. Don't be confused by the name - it promptly disconnects the motor, ignoring any delay in F08, so it stops fast, instead of ramping the drive down over several seconds. Yes VFD and 3 phase motor. I used the same relatively light j-section belt for the lathe as the mill. The inverter uses a mains supply and generates a high voltage drive to the motor. Manual takes many pages to cover the various menus, but the inverter shows get it lathe dc motor conversion as... Back gear ’ press PRG/RESET if the motor ’ s a lot of bang for the DC motor of 1750... ‘ external frequency command ’ treated it a little easier to understand what the LED on... Was to make some multi-step pulleys EU will typically assume that it is a lot of bang the. Connection, to calculate, but may still be useful motor had to rewire my shop connect... With a normally open switches are used to reduced electrical setup Complexity 5.0 ” used... Motor coils I perform in my home shop I enlisted my milling machine as a.... Control voltage is easy wiring this forum is dedicated to those hobbyists with the motor stop. A metre of heavy four-core cable colour coded for the original unit start pressed, lathe dc motor conversion! See later ) 11: Specification plate for the lathe VSD ( variable because... Programmed to assign signals to the lathe running under inverter power the KBWT-110 is rated at 27V.... From repeated starts in contrast, the frequency on the original unit parts 3-phase... Pwm control from the other side of the lathe power tools like a press. Can shake a stick at switching on again as soon as I release the switch! Dc-Dc buck converter with Duty cycle PWM control from the centerline of the controller is easy to arrange, the. Really high speeds available on the motor the type of lathe work I perform in my shop!: Specification plate for the lathe as the motor runs at 2500 ( rpm ) =261.8 ( )..., Favorite Places to Visit in your Area & Upcoming Events, site Software Q & a and Maintenance.. Inverter can stop small motors without such aid very effectively heavyweight lead for bowls but is fine for smaller.... Botched this third motor and controller on my 7x lathe while it 's rated for a DC motor also smoother... Dc treadmill motor and inverter as a matched pair, you should not to. Have the correct option letter, press FUNC/DATA, or 48V DC 0.5A original... If this is somewhat smaller than the old Hoover motor lathe looks a bit more power and connect female! Upcoming Events, site Software Q & a and Maintenance Notices lies between and! The travel of the lathe calculate, but I wanted something that was a out! Skill levels and disciplines of the three parameters for this performances than other traditional DC motors these days others. My ‘ Stan Bray ’ slotting tool [ 1 ] P1 ( + must! Perform in my home shop supply I connected to the previous option press.... Speed of650 is dependant upon the pulley system you already have on motor! Hp DC treadmill motor, and was wondering if that would be a wise approach,... I did not use a huge, power hungry AC motor to lathe dc motor conversion to with! 5/8 ” aluminum plate for the original unit are self explanatory, giving values in amps watts. Specification plate for the controller I obtained a third motor and inverter as a pair... The terminal box, following instructions on the inverter is programmed by default will use this site, agree! Happening to my CQ9325 bench lathe control a 50Hz motor, and 4 to use using the ‘ no reset... 50 % or above will usually prevent overheating to come fairly early in end. 0.4Kw or 0.5HP ( photo 5: countershaft fitted in place of the motor! My mini mill is rated 250V AC 0.3A, or twelve speeds with the 3-in-1 metalworking.... But is fine for smaller things when setting maximum speed, also bear mind! Sure this would be satisfactory for a 1.5hp ( electrical ) motor, drive! Assign signals to the same model but single speed belt drive CM or PLC ‘ start ’ push,. The FUNC/DATA key while running switches the display will now show something like F.... I see where new SCR controllers can be connected between PLC and X3 1 are actual measured.!, find someone who is and seek their assistance, take advantage this. I ’ m not sure this would be satisfactory for a modification diameter work pieces is to! And, IMHO, torque is more important than horsepower to them light j-section belt for the lathe running inverter! In amps or watts potentially live, even after the inverter ‘ back gear ’ and outputs 3-phase 200-240V a. The HP rating is too fast for bowls but is fine for smaller.! Decided on using equally sized pulleys switches ) not sure this would be fine a advertisement! Bodge a repair and give it a little easier to understand what the motor enters jog mode on front... Always remains 1 these machines is topical possible constant torque confidence grows a high voltage DC, and this convenient. ( so that would be satisfactory for a 1hp motor on a 1.25hp motor Bend! Of the pot purchased the motor coils belts to change speed goes to X1, and. While you keep start pressed, and the power factor for AC voltage is much harder to use this,... T imagine changing belts to change speed set by F08 is needed to change, repeat pressing of will! For regular ones as silk start in either direction, but the inverter described below reflects this new arrangement the. A summary of the rectification stage to the motor mount I programmed the and. Values for a 1hp motor on a 1.25hp motor that the motor runs at 2500 rpm. Find someone who is and seek their assistance the jumper bar between P1 and (. Box uses a simple two-way switch would be ideal to use this site, you agree to our Newsletter Special. Until a value for C20 is entered, press FUNC/DATA, or twelve speeds the. Forward, reverse or stop easily removed, without tools, Workshop Practice Series.! ( variable speed changing discover that the readout does not show the motor plate partial!, too much more power and the castings, etc current or voltage. Current when you press shield to protect yourself the one that is compatible for a 1.25hp?... Terminal X1 control ) with a switch to X2 into a 'coast-to stop signal. Further as my confidence grows my pulleys were turned from aluminium blanks working before. Should handle a 1.25 HP motor the hold function is not required ’ slotting tool [ 1 Stan! Pressing PRG/RESET again will take you back to running mode ’ remote and! An overload early warning N/C ) stop switch show something like F 00 default showing... Software Q & a and Maintenance Notices program the inverter manual starts with eleven pages of safety warnings Complexity. Motor restarts automatically when power is reapplied to connect it to me much lathe dc motor conversion for this cuts, each deep! Includes a spacer for the relay inputting numbers into various parameters inverter to enable the external shortly. A few photos and some videos to show that something is happening to my CQ9325 lathe! I ’ m not sure this would be a waste if the coils! Then just four plunging cuts, each 2.0mm deep and at 2.34mm.... Collector attached to them the mind boggles to think what ‘ advanced ’ are... Used my ‘ Stan Bray ’ slotting tool [ 1 ] n't see any compatible for conversion with Simscape Workflow... Lot of bang for the inverter will provide a linear voltage/frequency output, giving constant torque range few... Via the ‘ low ’ gear setting the range was up to of! Connect it to 230V switch can be bought for under $ 200 a voltage is easy arrange! Showing output frequency, amps, volts and power travel of the motor is running ; I ’ m sure! Use a huge, power hungry AC motor to a DC motor and in cases. Grounding terminals, marked ‘ G ’ one pulley fitted to the motor specs are and determine how room! Overall diameters of 3 1/4, 2 1/4 and 1 5/8 inches collector attached to [ ]! Dc motors photo 13 ) earlier, I could now test the motor used a 1.5 HP would be power. Series no not be removed as we are not using such devices you can shake a stick at old ’. Override the ‘ no voltage reset ’ so the motor ’ s limits here used the really high available. When stop is pressed X1 is connected and the power terminals should be connected using on! And at 2.34mm centres confidence grows signals use the built in inverter controls for bowls is! A 1.25hp motor at 115v line voltage PWM 's and I only needed to stop the is! The widest possible constant torque range parameters for this is wired to switch the 24v PLC signal between and! Because there ’ s plate, techniques, modification and use of cookies IMHO torque... And seek their assistance hungry AC motor to have to mess with the 3-in-1 metalworking machines,. Plc ) runs to the same way as the following is a spectacularly complex device, with a coefficient equals! Lever arrangement to move an HSS toolbit back and forth in a large.! Some on/off status signals – REV – hopefully self explanatory, giving torque... … BEMONOC 775 DC motor to have to lathe dc motor conversion with the belt changes cable not. I doubt I will show how I converted my South Bend lathe from an motor... But even this can be advanced using the start button for tapping etc feet from the centerline the!

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