Gallery, Projects and General > How to's
Metric Thread On Imperial Lathe
BillTodd:
Well, I braved the freezing temperature in my garage to cut a thread (20tpi with a sharp V tool) into a piece of scrap HRS at 30° (to parallel) and again at 61° (I'd normally use 59°)
The result was a failure as 30°, partly because of the Hardinge's fast retract top slide tore up the thread as it was pulled out, so requiring me to use the cross-slide to retract (thus ballzing it up). As expected the tool was cutting on both flanks, which doesn't make for a nice looking chip. You may be able cut a thread at this angle, but frankly it doesn't seem or feel 'right' and you'd get a better result feeding straight in with the cross-slide
At 61° the tool was again cutting on both edges which creates a squiggling tearing chip that does not compare to the nice curl at 59° that I'm used to. I will try it again (when it's warmer) with a full-depth insert to see if it make any difference.
Bill
doubleboost:
Hi
Bill
One of the benifits of using the compound slide is that the tool is wound back on the cross slide (boxford do a threading stop for this very reason).
Like you say it is a bit cold to play in the shop :( :( :( :( :( :( bad enough at work :( :( :( :( :(
John
BillTodd:
--- Quote ---Like you say it is a bit cold to play in the shop
--- End quote ---
I'm only half Geordie, so I'm not as well adapted to the cold; -2° is all I can cope with :)
doubleboost:
off topic but it is christmas :) :) :) :) :) :)
BillTodd:
geet . Aa'd not seen tha before
(Translated by http://www.geordie.org.uk/)
Bill
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