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| Boring Deep But Small Holes |
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| awemawson:
Got a collet chuck, and collets for the larger sizes (up to about 55 mm) but nothing below 20mm and they are silly money - well over £100 each - J56 is their name iirc and I've never been able to locate used ones which is why I fitted the hydraulic chuck and soft jaws. I'm sure my solution will be fine ..... Probably ! |
| PekkaNF:
Can you use slightly under size undersize carbide endmill and contrarotate it slightly off-centre? Like live tool setting on drilling. Pekka |
| S. Heslop:
Would it be possible to take them out and mill them? |
| awemawson:
No they need to be in situ and clamped with the same (hydraulic) closing pressure that they will be used under. I've done the job now with an end mill followed by a reamer. If you look at the arrangement in the picture attached to the original post, you will see an adjustable plate with pegs that engage with the jaw mounting holes. Pegs slide in curved slots to set the jaw spacing, and the clamping force is taken by those pegs. There is a very narrow tolerance on exactly where the 'fully clamped' position of the jaws ends up. Movement of the clamping cylinder is monitored by a pair of proximity switches. If the 'clamped' position doesn't lie between these limits the controller will not let you start the spindle. |
| PekkaNF:
--- Quote from: awemawson on February 17, 2015, 04:10:41 PM ---.... I've done the job now with an end mill followed by a reamer. ... --- End quote --- Helical reamer? Pekka |
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