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| Diamond Drag Engraver |
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| awemawson:
Well as intimated earlier I had an idea for reducing the side play so that fine engraving would be better. JS had suggested rectangular linear bearings but I wanted to stick with simple collet mounting. I found a 3/8" circular linear bearing sold by Marchant Dice, ordered up some 3/8" silver steel and put them together thus: |
| awemawson:
Compared with the Mk1 version it was somewhat shorter due to the length of the linear bearing, however as the silver steel was on the upper limit of tolerance (very marginally over 0.375 by maybe one or two tenths) there was no perceptible side play and a little pre-load on the balls in the linear bearing. |
| awemawson:
So what was the result. Well perfectly acceptable engraving :ddb: When I made up those EDM clamps from 304 stainless the other week, it was too hard to stamp with my Pryor letter stamps - I usually stamp my initials and date when I make something. Hence wanting the diamond drag engraver. So here is one finished engraved: |
| awemawson:
That lettering is about 4mm high. While I've been typing this post the machine has engraved the other nine clamps, with me popping up and down changing bits in the vice . Andrew |
| John Stevenson:
Very nice Andrew. Another thought is that Igus do these bearings with a polymer coating instead of balls and for short movements it's probably better than the balls which over a period of time will groove the silver steel. I know RS do the 12mm ones, don't know what other choices are out there ? |
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