Chris Russell: you tilt the cutter to match the helix angle of the gear so the profile is
correct, yes indeed. IF the appropriate change gears for the LEAD of helix
are available. if the lead required is in between available lead ratios, by
ALSO swivelling the table to an angle calculated by trigenometry (ie, 60`
will give HALF the lead, 45` is 1.4), then adding(orsubtracting) the angle
from the cutter will bring it back in line with the helix angle, producing
the correct profile, at a different lead.
ip1shevlin: very impressive
Anne Franksbrother: Tilting the head does not change the lead it only makes sure the profile of
the cutter matches the groove.
D1rtyraver: Good luck with the no-goggles approach. I hope it works out for you. Nice
clip, though. Thanks.
jrstow86: Hmmm the obstruction of safety glasses almost made me lose a few fingers, I
don't use them either. damned if you do, damned if you don't.
ModernMarine1: That is very very very cool
DieselCrawler86: Old machines are great, they allow people to do things rather then punch
them in on a key board. There is only one small thing that bothers me here.
He is not wearing safety glasses. It only takes a second for that to toss a
tooth even on plastic and you don't stand a chance.
MARK CASTILLO: according to them they did not supplied helix angle and lead,actually there
is,but its sad to say they only made experiment on making helical gear.but
on the other hand there manual machining knowledge are somewhat
jrstow86: Looks like the lathe is on auto scroll, not by hand...
TheManFromAlaska: Very Cool. I have not seen a set up like that before. Is it something that
you guys put together in your shop?
caerleon87: Very very good!!!
Chris Russell: this is the old school way of doing things. the dividing head is geared to
the table lead screw at a certain ratio so to advance so many thou or mm
per degree of rotation. as long as the maths is right, it cant fail! if the
desired lead cant be obtained with available ratios, tilt the head and
cutter over using trigenometry to find the desired lead... you have to use
your head with this stuff! safety glasses? only idiots and people that
tolerate working with idiots get stuff in their eyes.
EMT: Thanks! They sometimes skip corners and take the easy way. If they ever did that, I suggest you consult with a paralegal or lawyer. This way they won't be able to cheat you.