Search found 406 matches

by Conrad_R_Hoffman
Mon Oct 21, 2019 3:03 pm
Forum: Lathes
Topic: Winding springs
Replies: 16
Views: 2040

Re: Winding springs

I don't like winding springs on the lathe; seems dangerous. I use a fixture with a drill chuck and a hand crank.
by Conrad_R_Hoffman
Fri Sep 13, 2019 1:20 pm
Forum: General Discussion
Topic: Used endmills
Replies: 13
Views: 3093

Re: Used endmills

I bought a fixture to sharpen the ends on my surface grinder. The fixture works well enough, but you have to shorten the end mills a bit if you can't grind the flutes. Given the cost of a decent 1/2" end mill, I think it's worth it, but not every end mill can be saved. OTOH, "real" machinists will c...
by Conrad_R_Hoffman
Wed Jun 05, 2019 12:43 pm
Forum: General Discussion
Topic: marking tools
Replies: 15
Views: 3798

Re: marking tools

You can buy colorants for epoxy. Pick a good one and mark tools with that. You can get really creative and mill a small spot and fill it with color. Fairly hard to remove, at least harder than most paints.
by Conrad_R_Hoffman
Fri May 31, 2019 11:30 am
Forum: General Discussion
Topic: Which grease to replace old specification?
Replies: 10
Views: 3729

Re: Which grease to replace old specification?

Well known to people with old British sports cars having manual transmissions. They called out GL-4 lube back then. The problem is some gear oils started saying "suitable for GL-4 & GL-5 applications", but I was never sure if they were safe to use. Then there was a spec for limited slip rear ends, t...
by Conrad_R_Hoffman
Tue May 28, 2019 3:43 pm
Forum: General Discussion
Topic: Which grease to replace old specification?
Replies: 10
Views: 3729

Re: Which grease to replace old specification?

Obviously lubricants have to be chosen for the application, but in this case it would be hard to find a grease that wasn't up to the job. I seem to remember being surprised that one of my Kluber high speed spindle greases also mentioned open gears as an application. Seemed like an expensive way to g...
by Conrad_R_Hoffman
Tue May 28, 2019 12:00 pm
Forum: General Discussion
Topic: Drilling UHMW
Replies: 6
Views: 3260

Re: Drilling UHMW

I use that technique for all sorts of thin and hard to grip parts. Works great.
by Conrad_R_Hoffman
Mon May 20, 2019 10:09 pm
Forum: Milling Machines
Topic: Gear Cutting
Replies: 9
Views: 3184

Re: Gear Cutting

FWIW, I make most of my gears out of Delrin. They hold up great, can be cut faster and the gear cutters stay sharp longer. I'm sure there are places where you really need steel, but maybe fewer than people think.
by Conrad_R_Hoffman
Mon May 20, 2019 2:46 pm
Forum: General Discussion
Topic: Drill shank hardness
Replies: 32
Views: 6815

Re: Drill shank hardness

you can fix that with a torch and bucket of water. Not HSS. Hardening HSS is a not a process available at the typical Home Shop Guy. I make cutting tool from broken HSS bit but the only useful part is the web which basically limit the design to small grooving tool. Opps! You're right. Probably only...
by Conrad_R_Hoffman
Mon May 20, 2019 10:37 am
Forum: General Discussion
Topic: Drill shank hardness
Replies: 32
Views: 6815

Re: Drill shank hardness

I've never seen an HSS drill bit with a hard shank, cobalt included. If making something else, like a cutting tool, you can fix that with a torch and bucket of water.
by Conrad_R_Hoffman
Sun May 19, 2019 2:18 pm
Forum: General Discussion
Topic: Balancing grinding wheels- my new page
Replies: 22
Views: 4441

Re: Balancing grinding wheels- my new page

That sounds like my SG wheel! The only saving grace is that somebody else paid for it for a specific job. Once I balanced it and redressed, and you have to make sure to get it fully dressed, it worked well. IMO, not any better than my white wheels, but I don't do long run production grinding, which ...
by Conrad_R_Hoffman
Sat May 18, 2019 7:00 pm
Forum: General Discussion
Topic: Balancing grinding wheels- my new page
Replies: 22
Views: 4441

Re: Balancing grinding wheels- my new page

After talking to a machinist friend that I've worked with for almost 40 years, who's done a lot more grinding than I have, has never balanced a wheel and who thinks there's a good chance I'm out of my mind, I've changed the intro and justification a bit. Be sure to hit your refresh button if you rea...
by Conrad_R_Hoffman
Thu May 16, 2019 3:58 pm
Forum: General Discussion
Topic: Balancing grinding wheels- my new page
Replies: 22
Views: 4441

Re: Balancing grinding wheels- my new page

Wlw, didn't know a grinding wheel could get the measles!