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| Brass_Machine:
--- Quote from: velocette on September 07, 2012, 05:11:16 PM ---Hi David I have been doing a review of my posts on"Mad Modder" and would like to pass this on. Fitted a 1.5 hp tread mill motor and "Minarik" Motor Control instead of .5 hp original motor. This allows me to be able to use a 16 mm end mill cutting caste iron 2 mm deep @ 600 RPM 60 mm min traverse. Using the mid range pulleys that give a maximum speed of 1800 RPM. The improvement in power output is very pleasing with a low speed torque that the original motor never had Been a bit naughty and set the Motor maximum speed to 5500 from 4700 to give me 3200 RPM spindle speed on High this will only be used on small milling cutters. Eric --- End quote --- Hi Eric I have been debating using a tm motor myself. Been reading up n them, seems like a lot of them have cw rotation. I am curious, did the motor you use have cw rotation as well? 1.5 hp is right about where I want to be... What brand was the motor from? Thanks Eric |
| 75Plus:
[quote from: Brass Machine] I have been debating using a tm motor myself. Been reading up n them, seems like a lot of them have cw rotation. I am curious, did the motor you use have cw rotation as well? 1.5 hp is right about where I want to be... What brand was the motor from? [/quote] Eric, Most of the TM motors have some sort of fly wheel, usually a part of the drive pulley, that threads onto the motor shaft. This dictates a specific rotation even though the motor will run as well in either direction. I put a TM motor on my drill press and had to cut a key way and add a key so I could reverse the rotation. Swapping the polarity to the two input leads reverses the rotation. Some TM motors have the brushes off set from the center line of the motor. These motors are not as happy running backward. Joe |
| Brass_Machine:
--- Quote from: 75Plus on September 07, 2012, 06:15:35 PM ---... Some TM motors have the brushes off set from the center line of the motor. These motors are not as happy running backward. Joe --- End quote --- That's what I had heard Joe. Not having done that type of conversion before, I am trying to find out as much as possible. I wonder if there is a way to tell if the brushes are offset before buying... Eric |
| velocette:
Hi Eric & Joe and all others that are interested The motor I have is a "Brand New" one bought at an on line auction. It is made by Te Wei Engine Ltd (China) and is rated at 5 amps Whoops that is 1.25 hp NOT 1.5 hp Clockwise Rotation. This was not a problem as reversing the supply leads and it is now Counter Clockwise. The Flywheel was removed and discarded and Stepped Pulley fabricated and fixed to the shaft and secured with two "Grub Screws" to Dimples drilled into the shaft. The "New" motor would not fit to the Existing mounting so the yoke for the "Air Spring" was discarded and new one machined out of piece of cast iron. With a bit of thought this could be made "Adjustable" to give MORE "Z" Axis travel from 205 mm (Max Stroke on Air Spring) to 285 mm plus. Adjustment is by loosening the clamping screws on the yoke and sliding it up or down the two 20 mm columns Will attempt to tell the story with a few pictures showing Set on Low and Set on High with the motor mount as well Eric |
| 75Plus:
--- Quote from: Brass_Machine on September 07, 2012, 10:14:38 PM --- That's what I had heard Joe. Not having done that type of conversion before, I am trying to find out as much as possible. I wonder if there is a way to tell if the brushes are offset before buying... Eric --- End quote --- Eric, This sketch shows how the brushes are offset for single direction motors. I hope it helps. Joe |
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