| Gallery, Projects and General > Project Logs |
| Experiment Engraving Machine Dials |
| << < (3/10) > >> |
| mattinker:
That was nice to see! I think it counts as a project. Thanks Andrew, regards, Matthew. |
| BillTodd:
Snap Matt, very interesting :-) what about grinding the carbide to a sharp V D bit? (as used in the gravograph engravers) Bill |
| philf:
--- Quote from: BillTodd on February 21, 2016, 01:08:42 PM ---Snap Matt, very interesting :-) what about grinding the carbide to a sharp V D bit? (as used in the gravograph engravers) Bill --- End quote --- Bill, I've done just that for my PCB isolation routing cutters. The most difficult part is grinding the carbide to half the diameter. A diamond wheel helps considerably. I found a useful webpage with clearance angles for different materials: http://www.pilotltd.net/engraving.htm Phil. |
| awemawson:
Have you got some backlash in your dividing head? In the 4th image the gap between 50 and 51 looks smaller than the rest. Or is it an optical illusion? Phil. Well spotted Phil - I hadn't noticed that :thumbup: When I first drew the scale I'd intended to have it read 50-0-50 and started drawing the lines at the middle out to +50 then back to the middle and out to -50. I then changed my mind and re-numbered them 0-100 (well 0-0 really as the 100 corresponds to 0) When the program generated tool paths and G code it did so in the order that I drew the individual entities, so started in the middle to +180 degrees, then back to the middle and out to -180 degrees. This later version of CamBam allows you to optimise the cutting order, which I've now done so it engraves all the lines going clockwise, then re-winds and engraves all the numbers clockwise - so cutting will all be in the same direction and backlash eliminated. It does beg the question though why doesn't it show in the numbering, as any one number is being cut in both directions. It is just possible that the figure "0" on all the numbers has a more curved left side than right side, but the difference is nothing like that between the 50 and 51 lines that you pointed out. :scratch: At least my final version should be uniform. Nice to get it right, but in this application it doesn't matter a jot - the feed screw dial is 'zeroed' when one cutting edge of the drill is sharpened, then backed out and returned to the same zero for the other cutting edge. The scale calibration is just to show how far you have to go to zero. Just shows - this is all a useful learning exercise :ddb: |
| RotarySMP:
Did you grind a number of facets on that 1/8th Inch carbide or is it conical with half ground away? Mark |
| Navigation |
| Message Index |
| Next page |
| Previous page |