Gallery, Projects and General > Project Logs
Mill Power feed
Darren:
That's good to know Stew,
You don't need to understand it now, but picking up a few bits will certainly help later when you have it all in front of you :thumbup:
Darren:
Bit more on this tonight..... :ddb:
Thinking about Ralphs predicament in only having one handle I decided to do some re-thinking. Besides I belive the whole set-up will be more stable with the changes I have made tonight.
I ditched the delrin coupler and turned a new one from alloy.
I wanted a good fit so I used my bore gauges for a change to size the bore as I was going along. In fact it turned out so exact than when I tried the freshly machined and still warm coupler on the shaft, the cold shaft cooled it and I had quite a job to get it off again !!!
This will be fixed to the mill shaft with an 8mm grub screw
Next I decided that I needed a mounting plate for the motor, I decided to use a piece of MDF for the mockup and see how it goes. This could then be the template for the real thing later.
Note the pointy spotters for marking the hole locations on the MDF
I didn't take any pic's of making the board, but you'll see it later.
Now I needed a way to mount the motor board to the mill. So off with the leadscrew bearing block, marked it up for drilling and tapping to 10mm.
Sometimes things just ain't big enough, so you have to improvise :dremel:
A pair of tubes
Ends threaded to 10mm
Studs fitted to the leadscrew bearing block
And two tubes fitted.
Two inserts made with 6mm threaded ends
These slide inside the tubes and are a snug fit
Motor board fitted onto the sliders
Slide the motor onto the gear wheel to engage
Slide back to dis-engage
Simple pimple :)
And this nut stops it falling off, motor board slides to the nut when dis-engaged.
Another view
Darren:
Some videos,
Hopefully these will show just how well this set-up works,
Ralph, the motor moves, not the motor shaft. The shaft is fixed to the mill. You can use the other end to make a fitting to fix a handwheel to and it will work fine.. :thumbup:
And this is the finish, the line was my mistake, I stopped the feed halfway though for some reason only know to myself. Just wish I knew what the password was :doh:
The whole set-up is very rigid and secure. The idea is to fit a hand lever to move the motor and finish off with a proper cover to make it all nice and tidy.
Darren:
I forgot to say, That piece of ally is 3.5" long, the mill took 22min to pass over it, so almost 6.5 min per inch....
That seems slow enough to me, but then I've nothing to compare it to?
Darren:
Websterz,
I'm not sure I'd want to power a mill bed with a 170 DC motor, if something went wrong it's prob got enough power to do some real permanent damage.
Be better to have a motor with less power and have it stall or even burn out.
But, it would make a nice variable main motor, umm, now that would be nice.....send it to me, I'll make a power supply for it !!!
The drill motor is too fast, you won't be able to slow it down enough without it stalling unless you use gearing. Even the wiper motor is only just managing the real slow speeds. I have a feeling it would be better to gear it even though it is already geared. That way the motor speed can be doubled making it smoother running etc.
I'll see how it goes first though, others report they work fine and maybe I'm running it too slow anyway.
PS, you could build a power supply for that motor... :thumbup:
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