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Fixing the how NOT to make an engine

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Stilldrillin:
Progressing beautifully John.....  :clap:

David D

bogstandard:
You got it Darren, drop the bit in when the RT is centred and if possible zeroed as well, move it in the Y axis towards you (or even the X axis, if that turns you on), the amount you want the hole from the centre, drill hole, rotate to next position, depending on how many holes and so degrees required, drill hole etc etc. No fancy footwork involved.
If you have another thousand parts to drill, all needing to be the same distance from the centre, as long as you don't move the table, just keep dropping 'em in, drilling and turning etc etc etc.

Stew, I very much doubt it. Other things have priority at the moment.


Bogs

NickG:
John,

I really enjoy this thread. It's like a new engine, a lot of new buts but any critical / expensive castings you've managed to save and kept them nice and neat!

The guy is going to be chuffed, just out of interest, will you be giving him a sit rep on what you had to do to it? He could learn a lot!

Nick

ps. I really want a rotary table and chuck! Is yours a SC 4-jaw or independent?

bogstandard:
Nick,

The chappie has already had a progress report, and has given me permission to make up a much more complex posting to go onto a model boat site.

For me, fitting a 4 jaw independant chuck to a RT would be like trying to wear a barbed wire thong, a real PITA. If my self centrings run within a couple of thou true, then they are good enough to fit to my RT.

I am not boasting at all, but I have a few of all sorts for both the lathe and RT. If I had a choice, I would always use a 4 jaw self centring, and one main advantage is that they can hold square stock, but on the other hand, they can't hold hex, you use a 3 jaw for that. Swings and roundabouts I suppose.

One definite thing I do do though, if I buy either a 3 jaw or 4 jaw self centring chuck, I always buy soft jaws for them. If soft jaws aren't available, I go elsewhere and buy one that does. For true accuracy, if done correctly, soft jaws just can't be beaten, for RT or lathe work.

Thru my experiences, and I don't know if anyone else has found this, but I have found that, from new, my 4 jaw self centring ones have less runout than 3 jaw ones.

Bogs

Bernd:
Thanks Bogs, much easier on the old eyes.

Nice write by the way. One can learn some interesting ways to fix things.

Bernd

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