Servo Driven 4th Axis for CNC Mill

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awemawson:
OK enough mucking about, get on with it :hammer:

So hopefully this is the last 'trial assembly'

awemawson:
In all I'm quite pleased with it. If I were doing it again I would probably have not stuck so rigorously to the diameter of the servo motor, and reduced the curve of that end to the size of the stock to avoid those two flats. I'll probably blend them on the belt sander before the final 'put together'

Also I must try and get my hands on some corner rounding cutters - the cover would look far better with a radius on it's outer edge.

Making the four elements of the mounting using CNC have made me much more confident in going from a CAD drawing to something tangible, and I've also gained confidence in the use of the Heidenhain probe, allowing me to break down work, and re-set it with some confidence that it's accurately placed. The 'reversal exercise' is also useful in that there are occasions when I'll want to reverse a symmetrical part to machine it, and the 'reference point' will thus move.

Andrew

Pete.:
Nice looking job Andrew!

You must have a whole barn full of 'projects to be got round to - you seem to own 'one of everything but it needs fixing' :D

awemawson:

--- Quote from: Pete. on January 23, 2014, 01:50:39 PM ---Nice looking job Andrew!

You must have a whole barn full of 'projects to be got round to - you seem to own 'one of everything but it needs fixing' :D

--- End quote ---

Thanks Pete for the kind words.

Projects : yes well I've been saving them up :ddb: When we moved here not much got done engineering wise as we had rather a lot of sorting of the domestic buildings, and actually building the workshop, but now those things are on an even keel I'm going through them ticking off the list. However it's a long list :)

Need to sort the foundry, need to cast some aluminium billets :ddb:

Andrew

awemawson:
:ddb: Today officially is MY LUCKY DAY :ddb:

I recently won a reasonable quality 200 mm chuck on eBay that was nice and local.

First task today was to draw up a converter plate to mount the three jaw chuck on the 4th Axis table. Table has four main slots and four auxiliary smaller ones. As the face mounting chuck has three holes at 120 degrees and the slots are 90 degrees nothing matches - hence an interposer plate.

Then I looked at the extra four tapped holes someone has added to the table - hey just maybe two of those line up with the chuck and the third goes in a Tee nut in a slot. Tried the first pair and they were close but not quite right by about 3 mm. Tried the second pair - spot on, exact, bullseye :clap:

I'll need to round the end of a Tee nut to slide further into the short slot, and no need for an adaptor plate - yipee !

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