Transmission for table feed

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scout800:
Nice idea Baron, are you running that on a variable to 12 volts or going higher with the voltage? I havent been able to get out in the shop for the last few weeks to continue my build, hopefully i'll be able to get out there over the holidays i'll keep you posted . Thanx for the interest in my build, happy Holidays every one .

Dave.

BaronJ:
Hi Dave,

This is actually the second version that I built, the first being a little slow because the gears were too large. This one also has the motor and output shaft on the opposite side.

In use I find that anywhere between 6 and 18 volts covers the range of speeds that are most useful. I can bump up the voltage to 30, but this is really only a medium traverse speed, about 5 meters a minute.

If you want more details let me know.

scout800:
Nice work Baron! This is actually turning into a nice thread I think, and hopefully help full to others. My question is , is there a way to regulate 110 v house current down to make something like that work or would you need some sort of other power supply? I think your idea using the wiper motor is an excellent idea, they have plenty of torque and I think it's a worm gear drive isn't it? Thanx for posting, any more info, on this would be great.
Dave.

BaronJ:
Hello Dave,

First Christmas Greetings to all. :nrocks:

I did a build log on another forum for both versions of the mill table drive using two different salvaged wiper motors. Both came from the local scrap yard for next to nothing, also both wiper motors had dual speed motors giving a fast and slow speed. As you can see from the pictures they are handed and one also has an output shaft that is only about two thirds the length of the other. Both wiper motors have an M8 nut securing the motion arm onto a splined taper at one end of the drive shaft. The other end goes through the "Mazak" bell housing supported by a sintered bronze sleeve bearing to a plastic or fibre worm wheel that is driven by the worm machined onto the shaft of the motor armature. The worm wheel is prevented from floating by the plate that carries the switches for stopping the motor when it has done one revolution. The float control mechanism on the armature is slightly different on both motors. One has a thrust ball at the worm end of the shaft and the other has a washer at the armature end of the worm that bears on a short sleeve bearing. On both wiper motors the commutator end bearing is a plain sleeve with an oil wick surrounding it. Both wiper motors run in the same direction for the same voltage polarity. Whilst these wiper motors will run in either direction, they are intended to run in one direction only. This fact was the reason for choosing to use a tumbler mechanism for reversing the direction of table travel in addition the tumbler allowed the table to be disconnected so that the right hand, hand wheel could be used to set the table position manually.

With regard to the power supply: I have not yet got around to replacing my variable voltage power supply with a speed controller. I did find a very nice low voltage transformer that will provide 24 volts at 2 amps in the scrap yard, but have to design a power FET controller to use with it. Something like a 555 to produce a PWM signal to a power FET is the sort of thing that I have in mind.

I'll post some pictures and come back with further info.

BaronJ:
Hi Dave,

The first two pictures are general shots of the drive taken whilst testing and making the tumbler lever. The next two pictures are from underneath showing the indent mechanism to provide positive positions for the tumbler. There is a strong spring (not shown) used to press the long boiler rivet head into the indent, placed over the rivet shaft. The bottom picture was taken whilst testing that it actually worked to drive the mill table as desired.

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