Making the quill support system . . .
https://youtu.be/XCHHACbtZUc
Printable View
Making the quill support system . . .
https://youtu.be/XCHHACbtZUc
Making the quill DRO read out system . . .
https://youtu.be/k0RzN8e-utg
I finally got around the making the belt cover . . .
https://youtu.be/Qo_AJD6I0y8
Nearly finished now! This time I sort out the drive pulley by deciding the make a new one . . .
https://youtu.be/paU5MzLaKpY
Nearly there now but the knee brake is not working - can it be improved ?!
https://youtu.be/VyYliBezDVQ
Finally . . . .
https://youtu.be/JYPoXfyQKhA
The adventure continues. I love all the upgrades so far but the lack of space under the quill has bothered me . . . could it be improved !?https://youtu.be/FCTJYhJTTHI
Finishing the main motor plate and starting the electronic test bed . . .
https://youtu.be/ns9gk7bnt1Q
This time we test out the torque of the motor . . .
https://youtu.be/3ynnVW7Aeyo
Time to fit a better motor !
https://youtu.be/8H50aA5qFmk
In this video I tear the machine down to fit the new stepper motor drive system . . .
https://youtu.be/3gUWMikEw2A
Re-build time. Hope the motor can lift it!
https://youtu.be/jX7Htqf-tQI
Let's try that again!
https://youtu.be/dpJYvACdAjc
Trying to fix the backdrive problem . . .
https://youtu.be/uWZ9wvDDbaY
We're making progress now. Time to fit an electronic brake to the knee motor!
https://youtu.be/to4aJ8xVGaU
This time we get the knee DRO fitted and working . . .
https://youtu.be/hBq_jIvm-JI
you are not alone. Here is my friction brake and sprag clutch bearing that stops the knee back driving its' ballscrew. To attach the Z axis DRO reader to the knee I resorted to 3D printing :smile: Attachment 32188
Neat work!
Sprag clutches allow free rotation in one direction and transmit drive in the other. Can you explain how this is operating in your setup? Are you letting gravity lower it by letting off the brake and raising it by driving through the sprag clutch?
I am not good at explaining things and my drawings are functional rather than informative...
The knee originally had a 6mm pitch, left-hand screw and a 3:2 bevel gear reduction to give 4mm vertical travel per rev.
I fitted a 5mm pitch, right hand ball screw. First it connects to the stepper motor with a toothed belt, then it turns through 90deg using a 1:1 spiral tooth form bevel gear to reduce cogging. Then a 5:4 spur gear reduction. The new gear shaft, goes forwards, where it gets the rather nice 4mm satin chrome dials the mill came with and a Bridgeport style dog clutch and crank. Going backwards it has the sprag bearing keyed on to it. The outside of the sprag bearing has a friction brake. I used bits of timing belt for brake shoes.
When I wind the table up the sprags turn freely and do nothing.
When I wind the table down, or when it tries to wind the table down, the sprags dig in and it resists.
I try to adjust the brake so it feels the same going down as it does for up.
Attachment 32191
Attachment 32192
Time for some better lights . . . plus some bonus 3D printed parts!
https://youtu.be/QtFiKZJAtEU
Starting the enclosure for the knee lift electronics. I seem to like making it complicated!
https://youtu.be/Sq4Vks1GX0M
Almost finished the enclosure . . . .
https://www.youtube.com/watch?v=1c9HJKhr2yo
After sorting out some electrical issues the enclosure is finally working!
https://youtu.be/ql8pGgkSTpc
Updating the software . . . plus more hardware issues found!
https://youtu.be/hOgWNga-VWE
For the video above some people have shown an interest in the code so here it is in a zip file. This will open in most text readers if you only want to browse it, but to upload it to an Arduino microprocessor use the Arduino IDE software and paste the code in there. This is written in a version of C++.
The code is flat, no library calls or function calls are made (except for the LCD library).
There is some code duplication for similar functions, but I was OK with that.
The pulse generation is coded directly, but libraries are available to do this for you.
There are no interrupts, but it would be more elegant overall to use them.
There are probably many other ways to do this and probably better ways!
But it does work, and it runs fast enough for me.
Use it, modify it, laugh at it, whatever works for you. If you do use it as it is right now then include the text at the beginning so people know the source.
Attachment 32293
Well here we are, the last episode in the drill press upgrade series . . . . . probably.
https://youtu.be/PCXZfAHpc8s
I have seen almost all, if not all your videos. Very nice work you have done. Congratulations for your design and the ability to finish it.
Thanks. To be honest making the videos helps me stay on track and finish them!