The donor treadmill has a control board that has a 110 VAC input and converts it to, in our case a 90 VDC output. A variable frequency drive is essential for this project. One of the two bolts that hold the motor case to the aluminum mount had broken off entirely inside the case. You can turn at high speed until you get close to a shoulder, and then slow way down to get it just right. Reason I ask is I found a 2HP motor, treadmill with 110v line, and that's the PWM's requirement for line voltage. Treadmill motors start at 0 and have to be ramped up to speed each time. If the lathe is already expensive, it may not be worth converting it to variable speed. Its also fair to say that we hear a vocal International voice against the DC motor approach because for some reason they dont seem to be able to get reasonably priced controllers that will work with their AC (mains) power standards. This belt is "delicate" and gets damaged easily and is very difficult to source locally. Tip First, unscrew the mounting bolts that hold the old motor in place. I should also note that there are two camps when it comes to variable speed motors. Different speeds were achieved by stopping the machine and changing the position of the belts on the different sized pulleys. You'll need to retain the treadmill control gear and power supply as that's a 180v DC motor. I don't see pics either. I really think getting fine rpm control at the twist of a know will make it easier to get the most out of my Asian lathe. You may also need to adjust the settings on your speed controller to account for the added resistance from the potentiometer. Once you have signal, epoxy the magnet in place and let it cure. Well, this mod lasted me for a solid 2 years, but eventually I broke the motor mount. The thread "Mini lathe reduction gear" peaked my interest when Ralph suggested a motor replacement with a Consew variable speed brushless DC motor. A tree stump two feet in diameter makes that treadmill go fast. 2. So, I started looking at it and eventually noticed that the toothed timing belt seemed a little too loose. Here is the assembly as removed from the treadmill, Leeson 1.62hp motor, plenty of power. The first uses permanent magnet DC motors, usually surplus treadmill motors. Too, there is that the lathe model has the motor positioned where it limits some turning operations. Pacific Scientific. (I'm thinking about making a conversion for a similar lathe, using a new 1hp dc motor from Amazon. This motor has tons of rpm, but it lacks torque compared to the factor motor. Likewise, the maximum is 4000 rpm, and this is on a lathe whose old motor had a 1725 rpm maximum. jimi. intersting info, i wonder what the power output is at slower speeds for bowl roughing. You are using an out of date browser. To me "line voltage" in house wall plug in! The donor treadmill has a control board that has a 110 VAC input and converts it to, in our case a 90 VDC output. Check the specs to be sure theyre compatible with your motor. Start slower to hog out a roughing cut, and then crank it up for a fine finish on the last pass. Within some range of spindle speed and loading it would outperform a 1 1/8 HP motor. Recycled. I have had to bore out pulleys before to accommodate these odd dc motor drives, but never one as big as a step pulley. The third factor is the value of having a variable speed lathe. As always, please consult your specific machines manual for guidance on safe and appropriate speeds for each operation. I have a Delta-Rockwell 46-12 wood lathe purchased on Craig List for $400. What does the variable speed control on a lathe do? We happened to have a treadmill that was broken that we used as donor components of the motor and control board, the rest of the required items were purchased. Seriously. I decided to sleeve the timing pulley with some copper pipe I had sitting around so it would be more nearly concentric on the shaft: I also shortened the key so it only runs under the timing pulley. Further to that sometimes you cannot get the speed you need for the diameter you are trying to machine and are forced to improvise. For clarity's sake that is not a drum switch, it is a double throw toggle switch. Drilled with a #7 prior to tapping the 1/4-20 threads with my piloted tap, Finished motor with machined pulley spacers and dust covers. Gemini Controls Treadmill Drive Installation & Adjustment, In our case we chose to mount the motor below the table and run the belt down rather than behind the lathe as was original design shown in the illustration below. I have been looking at options, and there are a few routes to go with this. Option 1. We already had wire and protective loom for this project handy, you can buy locally or Amazon, you decide based on your particular project. Well.. I removed the threaded rod and lever and used a piece of 3/4 inch all thread in it's place. l will be following, i am wanting to do this to a drill press. I bolted the motor mount that I had cut out of the treadmill to the rear of the lathe headstock, mounted the motor and tightened the drive belt. Model #DC-92U. (I googled it.) Step 1: Types of Treadmill Motors I have seen 3 types of motors. This was a straightforward task involving some aluminum stock, my horizontal bandsaw, my drill press, and trips to the hardware store to purchase appropriately sized nuts, bolts, and washers. Gradually increase the speed to get a feel for how it responds. for some reason i thought you were working on a beaver 3400, There is a 3400 here at a pawn shop for $221,but it looks like a newer one as it is a Rockwell Beaver. Having now completed the modification, I have to say that it is fabulous! True Treadmill 2.5 hp DC Pacific Scientific 450 500 Motor Lathe Dark Grey USA . How cool is that? :-), Thanks! its easier to do as bill says. VFDs are used on most modern small lathes. Great instructable thank you for putting it together. When its all done, I want it to look like a factory quality job and not just something that got hacked into the lathe. :). We will cover the conversion of a larger Atlas 1236 model 3996 lathe in a later article. Just wanted you to know you're appreciated. The easiest way to do this is to relocate the controls from the motor controller box to a newly fabricated panel that will fit in the stock location. Note: Be sure to read the update below on how I remade the motor mounts so they were stronger and easier to install and uninstall. Nice motor -- 14 amps DC is a bit much for the KB products. Did you make this project? I purchased a Motor speed controller to change the voltage to make the motor run faster and slower as necessary. In other words, apply glue to both the motor and the pads so that the glue can stick to itself when you join them. Atlas Lathe treadmill motor conversion components used LED Digital Tachometer, AC220V Digital Speed Meter,4-Digit Tube Display 120PCS Premium Fridge Magnets 10K OHM Linear Taper Rotary Potentiometer LeMotech ABS Plastic Electrical Project Case Gardner Bender GSW-16 Toggle Switch (DPDT) 20A 125V On/Off/On The motor controller came with a 500K Ohm potentiometer as the speed control, but this didn't give me enough control of the motor speed. You can see what it looks like down below. Not sure that my equipment can handle it. Well.. Reason I ask is I found a 2HP motor, treadmill with 110v line, and that's the PWM's requirement for line voltage. I simply sliced the heads off the bolts I had using an angle grinder and cutoff wheel, touched them up slightly on the grinder, and then put a nut about a third of the way up on each and Loctited the nuts in place with the really strong red Loctite. The control board has seven connections you will need to make. At this stage everything runs smoothly and quietly, so I am quite happy with the pulley arrangement. It's sturdy. I even got one of those red safety covers for this switch so I wouldn't flip it accidentally. Because no matter who you are, you deserve to experience the very best. The answer is yes! Aha, says I! I dialed it up to 30 or 40 rpm at the minimum. Actually, it's three bolts. 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This conversion is absolutely awesome and highly recommended and should have been done by us a long time ago. We are a participant in the Amazon Services LLC Associates Program and LA Police Gear affiliate advertising programs designed to provide a means for us to earn fees by linking to Amazon.com and LA Police Gear sites. Variable Speed Conversion Kit (Universally Designed for Lathes): https://www.youtube.com/watch?v=FSMGOP01ulw, https://www.youtube.com/watch?v=ZFVuJ0hwNnw&t=194s. on Step 8. ), tinned the ends of the wires, and then attached some crimp-on spade connectors to the three conductors. 2 run to the shunt-field current , 2 run to the armature. Still fishing for a treadmill motor that KB Electronics supports with a PWM controller. Particularly the very best of something you will use often, like a screwdriver. 2. I have an Optimum TU2506V, (V: read VFD) which has this setup and find it excellent. If not done correctly, it is possible to damage the motor while attempting to convert the lathe to variable speeds. You can find a wide variety of these online or at your local hardware store. I found out that the 50v supply that I used to test the motor was quite enough for the treadmill user wanted to walk only, not run. At very low speeds, the system stalled fairly easily. Installed in a headstock as I suggest it will increase max spindle RPM to over 9000. Relaunch of Hobby Machinist Mentoring Program. Steamchick.. Steve Jordan put one {crank} on his Myford lathe. I then took the thinner material and made a couple of side plates that are held on by the corner holes in the big plate at top and bottom. Speed Dial: A continuously variable potentiometer. When I got them home I started taking them apart. This will be used to connect the VFD to the lathes motor. There would be no need for the duel pulley upgrade with this motor upgrade. Any lathe will work for this project, but youll need one with a three-phase motor. Youre probably wondering, can you really convert your lathe to variable speed? (Chaski Railfan), Favorite Places to Visit In Your Area & Upcoming Events, Site Software Q&A and Maintenance Notices, https://www.galco.com/buy/KB-Electronic 125#bottom, http://www.kbelectronics.com/manuals/kb manual.pdf. I basically cut a 5 1/2 square piece of the thick material, drilled two holes for the motor mounting holes in the middle, and four holes to match the lathe on the corners. Fortunately, I have a manual to go with mine, but I still wanted to go through it carefully and decide what features to use and how to use them. 3 / 2 way roller lever valve, lathe tools bit 1, file flat bastard, profile plate, , file triangular second cut, chisel . Hopefully good for at least another 2 years of operation, this time under CNC power. 700 , 545, back gear 250 , 145 , 55 . I have a Harbor Freight 12 X 36 Wood Lathe. The amperage rating on the DC motor is not the amperage the treadmill will be using from your wall outlet. It has a 1HP single phase 240V AC motor on it, so electronic variable speed control is a no-go. This page was generated at 07:45 AM. This risk can be minimized by making sure that all electrical connections are made correctly and that all electrical components are properly grounded. Save my name, email, and website in this browser for the next time I comment. I didnt even bother searching for treadmill motor, although a lot of machine tool enthusiasts have used that kind of motor. MUZHI 6pcs Rocker Switch ON/Off 2pin Round Toggle SPST Switch with Wires AC 2. There are plenty of DC controllers available on eBay. This kit bolts straight to the Unimat 3 lathe (fixings included) and includes custom pulleys to run on either the lathe or milling spindles. . Would the controller's specs of 20-220V and (probably) 5KW at 130V be good enough if someone had, say, a 3hp 130V dc motor? 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And extended the wires so that i could mount it on the sized!
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