Boxford Rotary table adaptor

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Darren:
Chris, I just noticed that you do not have a back register on your thread. This is what the chuck squares itself with. Without it your chuck is never going to be in line and square on threads alone.

Threads are not used to line a chuck up, just a method to fasten it. I think you'll have to make another spigot.

Make sure you machine the register and the thread in one hit withou removing the part from the lathe. After making that I'm sure you'll have a much better result.

Good practise anyway ... :thumbup:

bogstandard:

--- Quote ---If only someone supplied a slimline rotary table.....
--- End quote ---

That would not have solved your problem.

I too have major clearance issues for some setups, and I have a much deeper throat on my mill.

Everyone is striving to fit a chuck on their RT, including myself, when in fact an RT is a lot more versatile than that.

The slimline one you were looking at was just too limited in the accuracy stakes, you may as well have used a lazy Susan with felt tip markings around the edge, and later, when you learn how to use the vernier hand wheel and dividing head, you will be thanking everyone for :poke: you down the road of the one you have bought.

Oh! ye of little faith.

I have most probably only achieved a height saving of about 10mm by making my new backplate, but every little helps.
My biggest problem solver has been to use dedicated spindle collets instead of a collet chuck. They have saved me about 50 to 75mm in the fight against clearance issues. To such an extent, I very rarely use my ER collet chuck any more.
Also, people say, why do I need so many drill chucks? By using the smallest chuck for the drill that I am to to be using, I can save myself precious mm's when it comes to a tight for height setup.
I don't buy tooling just for the sake of it, there has to be a reason for it. The difference between the smallest and largest chuck is about 35 to 40mm in gained clearance. Maybe the difference between getting the job done or not.

So it isn't just your RT you have to look at, you have to scan the overall picture to achieve what you want.

Bogs

raynerd:
John, I was only teasing regarding the slimline - I know the Vertex is much better. I went in and looked at them both side by side and the vernier scale and no wheel reading including absolutely no minute accuracy I imagine would really limit it.

Darren - "Chris, I just noticed that you do not have a back register on your thread" - the thread OD is 1.5" and if you look at the back of the threads there is a area none threaded and larger register at 1.75", the thread does butt up against it so I thought this would be OK. I will probably have to make this again with a bigger register. Before I do, I`ll take geroli`s advice and chuck a piece up on the lathe and transfer to the RT and re-test for runout.

Cheers
Chris

Darren:
I think your register need to be bigger Chris, it is a bit on the small side.

raynerd:
Yea, I totally see what you mean. If I`m being honest, the thread looks like something has been gnawing on it so could do with being done again. Certainly not a waste of time ... learnt a lot.

Thanks for your help and interest :beer:

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