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View Full Version : Trunnion on a indexing spacer?



Hot Bob
07-03-2010, 06:45 PM
I'm trying to figure out fixturing on some cylindrical parts. They need machining operations performed on the face and then need to be turned 90 degrees and a precise hole bored perpendicular. I'm picturing a clamping block holding four parts, secured to a trunnion, secured to a indexing spacer in the vertical position with a tailstock at the other end. This is for small production runs on a VMC with an APC. I cannot afford to buy a 4th axis trunnion setup but I have a super spacer. Has anyone done this or seen it done? Is this a crazy idea? The risers on the right are the ones I'm trying to work out.

Bob

http://img.photobucket.com/albums/v205/badman14/IMG_4121.jpg

John Stevenson
07-03-2010, 06:51 PM
Part mounted onto angle plate held in 4th axis

Do top face operation

Index 90 degrees and offset to do side hole operation.

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Hot Bob
07-03-2010, 07:23 PM
Part mounted onto angle plate held in 4th axis

Do top face operation

Index 90 degrees and offset to do side hole operation.

.

Yup, thought about that. Not enough real estate. I'd like to get at least four pieces in the machine at a time. That would mean they need to be mounted in line. Hence the trunnion idea. I would probably use a pair of angle plates to attach the trunnion table to. I really would rather find an off-the-shelf solution but, my budget is pretty limited.

Bob

John Stevenson
07-03-2010, 07:32 PM
Long angle plate mounted in 4th axis with end of angle plate supported on 4th axis tailstock.

Mount 4 pieces etc.

Or even use a piece of square with one end turned round to fit 4th axis chuck and other end centred, mount to top of square.

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