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1/2" coventry die head on a myford super7
| Andrew Johnston | 29/09/2018 10:20:02 |
 7061 forum posts 719 photos | Posted by herbert punter on 28/09/2018 19:42:49:
Purely curiosity, what speed should the die heads be used at? My Book of the Coventry Diehead gives the following guide: Tough steels 5 to 8 ft/min General mild steel 10 to 20 ft/min Free cutting bolt steel 25 to 50 ft/min Cast iron 8 to 12 ft/min Brass and copper as turning speeds, presumably with HSS tooling As always the precise speed will depend on material, finish required and the pitch and form of the thread. The last set of 1/4" BSF bolts I made in EN1A were threaded at 500rpm, so about 32ft/min I can't remember, but I think my height gauges came as part of job lots, albeit from Ebay. There's probably an advantage at a car boot sale; the seller probably won't have a clue as to the purpose of any height gauge. Andrew Edited By Andrew Johnston on 29/09/2018 10:20:27 |
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