Building the Division Master and modding my RT

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NickG:
Nice 1 John, this makes it ultra clear for other people considering this mod. I really could do with a rotary table of any sort but one day will have one like this.

Nick

Bogstandard:
Sorry about being a day late, but the weekend was a little too much for me.

So anyway, I got another bit made today, and it wasn't as straight forwards as I thought it would be. A couple of fixit jobs had to be done, all because I thought I had everything covered.

You know what thought did? He thought he had only farted, but in fact, he had s**t himself.

So it all started this morning, after I got back from taking Bandit for his run, he has to run, otherwise he gets left behind, as I am on my buggy.

I thought I had some 60mm ali bar to make this unit out of, but it turned out to be 75mm, and I wasn't going to waste material by having to turn it down that much, so I settled on a smaller piece, that was 2mm under my ideal size. But it won't matter that much.
So the first job was to part it down to rough length.

Following that, faced up to exact length and the spigot end that is going into the flange was turned on the end.

Followed by a 19mm drill all the way thru.

The boring out took a bit of time, but with lots of patience and plenty of lube, I got it to final size.

The now tube was flipped end over, and the 19mm hole was opened out to the required 21mm.
So that was the basic tube made, or so I thought.

It was tried for a rough fit, looks OK.

Then an assembly fit, spot on. I was getting very cocky by now, things were going great.

So just a roughie mark up where the access hole needed to be, and it was time for lunch. Bad move.

So duly fed and watered, I decided to carry on, instead of my usual beauty nap in the afternoon.
Onto the mill with it now, and I hacked a 10mm slot thru to roughly where I had marked it up. It isn't critical, it is only there for guiding the coupling down the tube on assembly and tightening up the grub screw.

This is where I needed my RT, to put the three holes in the bottom, but because it is stripped down, I used the PCD function of my mill DRO for doing it.
So the first thing was to get the hole in the tube centred up with the quill and the DRO zeroed.

This is where things started to go pear shaped.
I was just about to drill the third hole, and then realised I had fed the wrong data into the DRO, and I was drilling on an arc rather than a circle. The second hole I had drilled was way off position.
So all I could do, rather than making a new tube, was to accept the extra hole (it won't be seen), re-enter the correct data and carry on drilling the second and third hole. They ended up in their right places.

After that bodge up, I tried to fit a screw thru one of the holes from the inside. It was then I realised I hadn't allowed for the cap screw heads while boring, and they were catching on the inside of the bored tube, kicking them over at an angle.

So what I did, was to remount the tube back onto the lathe and from about 15mm in, I enlarged the internal bore, so that the screws would fit OK.

This pic shows the duff screw hole, and the enlarged bore.

There is something to be learned here, don't try to machine while you are tired, as I was. Not just for safety's sake, but you can easily make simple calculation mistakes, as I did.

So anyway, things turned out OK in the end. It is now awaiting the flange to be made, which is tomorrows job.

I'm now going to catch up on my sleep that I missed this afternoon.

Goodnight

Bogs

Divided he ad:
Does the job John :thumbup:

At least you had a way out of the bodge! :borg:

Hope you manage to get what you want done tomorrow :dremel:

Ralph. (listening to a bit o' Elvis :headbang: )

NickG:
Bogs, unfortunate error but no harm done really though. I often make silly mistakes when am tired but am just beginning to know when to down tools and go in now.

Nick

Bogstandard:
Ralph,

You know what it is like here, one unexpected visitor, and the day is gone for me. I have to plan each hour I can be in the shop at the moment.

I'm glad you like the oldies :headbang::ddb: :ddb: :nrocks: :nrocks:

Nick,

At one time, things wouldn't happen like that with me, everything would be checked and double checked, and very rarely would something be amiss. But I have to accept now that I am just not the same guy I used to be a year ago, and I now work to the best of my abilities. It is very frustrating at times.

But I am still enjoying what I do, and that is the only thing that matters now.

John

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