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| A Moments Inattention |
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| awemawson:
I've been setting up to make some work clamps for the wire edm machine out of 304 stainless steel. Simple single hole tapped M8 and an 8 mm slot. Needed a few so drew it up in Featurecam to make on the CNC mill. To set tool lengths my 'zero tool' is a Heidenhain touch probe so the procedure is: A/ Use Heidenhain Probe to set Z = 0 as top of Vertex Z-Gauge (controller automates this) B/ Set each tool length measured to top of Vertex Z-Gauge (led lights up on contact) then put values into the 'Tool Table' C/ Use Heidenhain Probe to reset Z=0 to be the top of the work piece |
| awemawson:
Now this process works spiffingly if you remember to do ALL the steps :bugeye: Yesterday in a moment of inattention I failed to do the last step - probe the work piece. Result being that instead of being the top of the work piece, Z=0 is now 47mm BELOW the work piece. Generally this isn't considered good, and most definitely the first tool to be used, a centre drill, was most unhappy being asked to enter a good way into a piece of 304 stainless that it was only supposed to go in 0.5 mm ! Net result was one heck of a big bang, the stepped jaws being sheared off the vice, the centre drill disintegrating, and the BE200 / CAT40 collet holder being consigned to history |
| awemawson:
Now those HT socket cap screws are M8 and sheared clean off - what force does that take? Not surprisingly the control reported a 'Gross Positioning Error' but amazingly after a reset, other than the damage shown in the photos the Z servo and bearing SEEM to have survived A bit of tidying up and sorting out, and a replacement holder installed and calibrated resulted in the first SS EDM Clamp - but this sort of happening is not really wanted :scratch: Nine more clamps to go. |
| John Stevenson:
Clumsy bastard |
| awemawson:
I very nearly added that comment myself John as I just KNEW that'd you'd be along shortly :ddb: Andrew |
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