I purchased a Vertex Rotary table (rotab/RT) a few months ago and it has seen some good use but I will hopefully use it even more for dividing in cutting my clock wheels. I have purchased the dividing set as an add-on to the rotary table which comes with three plates for easy dividing. I have studied how to use the dividing plates and after a trial with them, there is no way I can keep concentration for long enough to use them on a 60 – 120 tooth wheel! If it was 1 to 1 then maybe, but I know I`ll mess up eventually and then there are counts which can`t be done with the plates.
I know, I know …. I should be able to use them and people have used them for years and years in the past but I fancy dabbling again in CNC. When I say again, I mean after my horrific failure at converting my X3 mill to a CNC X axis! A failure maybe, but at least I know now the basics of CNC, the software and the basic setup. So here goes, this is Part 1 but I hope the complete setup to be finished within a week of this post:
This is what I am aiming for –
these are £380 for the CNC kit only (i.e not including the table), I`m hoping to build similar with some help on the electronics but more on that in the next post when it has arrived. For now, I just need to remove the handle and make a bracket to fit the motor spindle to the rotab spindle. Basically, it should look like the one above but without the electronics gizmo… for now!
Vertex 4″ Rotab with handle removed:
I`m going to need to couple the shafts together and for that I`m buying a 12mm (shaft axis diamter of rotab) to a 1/4″ (shaft dia of motor) oldham coupling. This will also compensate small amounts of miss alignment. So basically we just need to bridge the gap and make a support for the motor. I`m using a tube of ally that was in the scrap bin:
It was bored out to leave a little lip on the inside of the bottom end:
A disk was cut and bored with three holes drilled matching the rotary table threaded holes:
The disk drops down the tube and against the lip, when bolted against the rotab is locks the tube onto the table:
Now the motor needs to be mounted on its 4 holes in the position below but I`ll have to space it out another 25mm to fit the oldham couplings that will be inside.
So that is the idea but I need another spacer (ideally a longer tube would have done!) but I also need more width for the motor mounting points. I`m going to use this and once bored out it should work a treat!
Just need the oldham couplings to arrive and then pickup the electronics. More details next episode!