The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

The Craftmans Shop > New from Old

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awemawson:
That is an extremely kind offer Ade, however mine is also 32 mm Ade by about 10" and would hurt if you dropped it on your foot :lol:

The problem with that bar is the way it is mounted with so much 'stick out'. As it mounts perpendicular to the tool disk it's total length has to be exposed with only the depth of the holder contributing to rigidity. I could cut it much shorter but that seems a scandalous waste.

Using the conventional 25 mm square lathe tool with carbide inserts fully sticking out the finish is actually quite acceptable, however I have decided to cut it in half reducing stick out and have ordered a replacement to salve my conscience as it will be a usefully equipped tool holder for the future.

awemawson:
After what seems a ridiculously long wait at last the postman brought me the new SDJCR2525M11 lathe tool holder. I didn't want to truncate the original until I had a replacement.

In practise I've been tied up with significant animal care issues this week as the other half has been away, so my life has been sheep, chicken and green house and polytunnel watering so probably couldn't have resumed work anyway until today. Mind you this HAS meant that the dogs and I can be in the best sitting room without risk of attack :clap:

So - cut the blooming thing - well first careful measurement showed that I could only truncate it by 30 mm and still reach the work piece without the turret entering the protected zone, but 30 mm can be quite significant in terms of chatter.

Hacksaw job :scratch: Well just as well my hardness tester was to hand - measuring 415 Brinell it's a job for the angry grinder. Severed and tidied up on the disk sander it is now in the turret awaiting it's Z & X offset being measured. Hopefully I can do this tomorrow between guests checking out (two sets) and guests checking in (another two sets).

. . . only a little step forwards but at least it IS forwards !

awemawson:
Argh . . . . this is becoming a nightmare :bugeye:

I had overlooked the fact that the adaptor is only 45 mm thick off the mounting flange whereas the temporary 3 jaw manual chuck my test piece is mounted in is considerably thicker at about 140 mm to the relevant bit of the work piece meaning that far from shortening the tool I need to EXTEND it 76 mm :bang:

This of course is why initially I'd used the fat boring bar but rejected it on vibration ground

. . . . time for a rethink - I only need to turn about a 15 mm length of taper but it has to be 'dead nuts on' as far as concentricity and angle :bang:

hermetic:
You have saintly patience Andrew, I have been watching, but keeping quiet at the back of the class in case I broke your train of cogitation!

awemawson:
It's getting sorely tried at times Phil ! This wasn't intended to be a saga to rival 'Noggin The Nog' !

I've taken up Ade on his very kind offer of a 32 mm boring bar that I can trim to length so hopefully I can pull something out of the bag.

I did actually investigate how to reset the 'Z Travel Software Limit', but it turns out that what is reported as exceeding the software limit is in fact a hardware travel limit set by cams and a microswitch. I could move them but I think extending Z travel by 75 mm past the designers intention is pushing it too far - I don't know what else such as ball nuts and covers and guides might suffer.

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