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| John Hill:
Chuck, I intended to have the motor on a pivot so that I could easily disengage the drive but it proved too difficult to get the required rigidity. Now I am thinking of having the worm wheel loose on the shaft with a fixed wheel that I can drop a pin through. Dean, I have three of these motors so naturally I choose to use the one that fitted in with the colour scheme! Rob, I have not yet designed a control for it, so far I have just been using a variable voltage power supply. Maybe I will use a simple idea I have of being able to control it via a PC serial port, a very simple concept which gives 10 speed steps but I need to put a bit of thought into that one. If I do have PC control of the motor and I figure out how to read the DRO signals I could start on a CNC development programme. I have most of the bits for similar drives for Y and Z (knee lift). Thanks for the comment Don. |
| andyf:
John, if you go the PWM route, I found a Velleman control board kit was cheap, easy to assemble and worked well. Have a look at the specs and PDF instructions to see if it would suit. Scroll down the menu on the left of this page: http://www.esr.co.uk/velleman/products/index_kit.htm until you get to controllers, and click on the first one - K8004. Andy |
| John Hill:
Thanks Andy, I have used Velleman kits for a few things in the past. In fact I think I have one of their usb to digital IO boards somewhere that could be useful testing and working out the desired voltages and PWM ratios etc. |
| John Hill:
...it looks a bit rough but it does work! Now I need to make a PWM controller for it and tidy things up a bit.. http://flic.kr/p/bb5py2 The motor is from a computer mag tape drive (about 35 years old), I made the worm and wheel and the rest is 9mm aluminium plate, also from the old tape drive. The motor is rated at 48v, it will drive the table down to 5v but is shown here at 13v smooth DC from an old bench power supply. I feel the wheel will not last long and I am sure it would be OK being able to run a little faster so I will probably be making another, but smaller, work and wheel sometime. |
| Dean W:
Neeter 'n skeeter, John. (Works well!) I wonder if a spring loaded detent ball would work as a way to swing the motor in and out and still hold it firmly when the worm is engaged with the gear. Two shallow holes in the main mount, and the ball and spring mounted in a small housing on the motor mount. Just a thought. Don't know if that will suit your setup, but might be convenient. |
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