Gallery, Projects and General > How to's
Threading by hand
wongster:
Ah... I got what you meant now. Strange that it was cutting at every pass of the same depth and suddenly the cut deepened. Maybe it was cutting less than the amount I dialed and the accumulated amount kicked in all at the offending pass.
Any idea how I should drill the hole to hold the die without a rotary table? Or I should get one for this and future projects? The Sherline's rotary table cost quite a bit and there is still the decision whether to go with the CNC ready or manual version.
Regards,
Wong
andyf:
Hi Wong,
It looks OK so far :thumbup:
I found the hardest bit was to position the holes for the setscrews which hold the die in place. They have to be the right distance from the bottom of the counterbore; too close is better than too far away, because in the latter case the die isn't properly supported from behind and can tilt slightly as it is forced on to the work. If doing it again, I think I would drill the holes first, then bore out the counterbore to the right depth while making trial fits with the die.
Another problem I had, being merely an amateur tinkerer with no rotary table, was that though the three screwholes were at 45o to each other on the outer surface (and for me, marking out for that was easier said than done) they certainly didn't come out that way on the inside. I ended up enlarging the holes so I could get a silver steel (drill rod) punch through to mark for three new holes at the correct angular spacing on the opposite side of the inner surface of the bore, then following up with a drill to drill from the inside. That rescued the job, once the unwanted holes had been plugged.
By the way, it looks from your pics as though the body of the holder is long enough to bore out for a different size of die at the other end. My dies are all either 13/16" or 25mm, so I made my dieholder double-ended.
Andy
wongster:
--- Quote from: andyf on June 19, 2010, 12:59:34 PM ---By the way, it looks from your pics as though the body of the holder is long enough to bore out for a different size of die at the other end. My dies are all either 13/16" or 25mm, so I made my dieholder double-ended.
Andy
--- End quote ---
Hi Andy,
Thanks for your input. I always wanted a rotary table though I've nothing in mind what to do with it till now. ::)
About making a double-sided die holder. How are you holding the die holder? I intend to drill and tap for 3/8-24 so that the adaptor for my jacob drill can be used (one end of the adaptor MT #0 for the tailstock and the other end 3/8-24).
Regards,
Wong
No1_sonuk:
The double-ended ones (and single-ended for that matter) usually run on a smaller shaft that goes through the centre. To use it, you hold or turn it by hand, while turning the workpiece, and the shaft in the tail stock keeps it straight.
wongster:
Hi No1_sonuk,
Do you have a pic or 2? Can't really visualise this. I'll also search the forum for double ended ones to see how others had done.
Regards,
Wong
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