Rotary table chuck mount

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bogstandard:
Don,

I don't mind admitting to my mistakes, it is all part of the cycle of learning.

I made a mistake with the original concept because I didn't realise how flimsy the MT tapers would actually be.

Hopefully, this time I have got it right.

Don't get me wrong, the original would and did work just fine for normal machining, just not strong and rigid enough for what I want to do.

Next week, I should be able to give the idea a good try out, and see whether it needs to go back to the drawing board yet again.

John

bogstandard:
After leaving this post in a bit of limbo, I got off my backside today and finished it off.

So this is what was done first. I got the holes in the adapter plate drilled by bodging together a holder and drilling them using the RT.
As you can see, the t-nuts are a rather weird shape, that is because with the disc being so small, I was working at the very inner limits of the slots. They hold just fine.
I marked up the adapter with a '0', this hole, if ever the plate is removed, will be put back in line with the '0' on the scale around the RT.

This is the side you very rarely see. But I noticed that the slots and holes were there if ever I wanted to put locating blocks onto the bottom. So why not?

So I got my aligning blocks off the mill, and they fitted perfectly in the slots. So they are the same as the mill, 0.625" wide.
This is going to be real easy for a change. So I grabbed a bit of steel scrap and set to work.

First off, the bar was turned down to 0.624", this will allow for a minor irregularity in the mill table, if there is one.
It was then drilled thru with a 5mm drill, and a recess put in the end for a cap screw head. Two were made, both 1/2" long.

They were screwed into position in the slots.

It fitted perfectly onto the mill table.

And a check with a square showed they had done their job.

The RT was bolted down into it's final resting place, and I got the RT perfectly aligned with the quill.

Reset the DRO to zero, just to make sure nothing had moved when I do the next check.

The aligning spigot was dropped into the 2MT centre of the RT, and the adapter was bolted down into position.
Checking to make sure the table hadn't moved at all, I checked the runout of the centre bore of the adapter.

Just under 1 thou runout, in fact as close as I can see, 0.0008".

That will do me just fine.

As an added bonus, I have gained about an inch in throat depth over the previous fitting.

So at this time, I class this as a good result.

Bogs

NickG:
Well done Bogs, by doing some good work on your own tools the capability any capacity of your machinery is growing.

Nick :thumbup:

bogstandard:
Nick,

These results prove that using cheap soft jaws does work when needing to make very close tolerance concentric parts. I don't think I could have got it this close even if I had used a four jaw.

I only have two things to do to complete the interchangeable system, one is the make an ER32 collet chuck to a Myford fitting and the other is to get the clamping sorted for the 5" faceplate I made for the system.

But I have my first repair to the mill before doing anything else.

John

Jonny:
Nice one Bogs i have same Vertex 8" rotary table very few about and shame they have 4 slots.

Mines predominantly set up for one purpose with 5" chuck on. Recently chucks gone out of alignment after almost 10 years to 0.23mm and need to do over Christmas.
Chuck i used came off my old Myford but done away with back plate wanted total rigidity, made up a spindle and brutally drilled straight through chuck in to table and tapped it where T nuts couldnt be used. Just one basic job i go through 22 revolutions machining at every 30 degrees with dividing plates, done well over 500, cant grumble its had some stick and more than paid for itself several hundred times.
Theres a way of getting rid of the backlash in rotary table as well, not bothered me up to now as i go in one direction but hopefully do it over Christmas as well with the coolant.

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