Search found 400 matches

by Conrad_R_Hoffman
Mon May 20, 2019 10:09 pm
Forum: Milling Machines
Topic: Gear Cutting
Replies: 6
Views: 232

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: 31
Views: 399

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: 31
Views: 399

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: 506

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: 506

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: 506

Re: Balancing grinding wheels- my new page

Wlw, didn't know a grinding wheel could get the measles!
by Conrad_R_Hoffman
Thu May 16, 2019 1:09 pm
Forum: General Discussion
Topic: Balancing grinding wheels- my new page
Replies: 22
Views: 506

Re: Balancing grinding wheels- my new page

The data output speed on those Witmotion units is low. I wouldn't trust them for vibration work. Now I have to look up gel cell wheels! edit- never mind, that's my SG wheel. Dressing is important for those and I probably don't have the best diamond for it. I detest most Youtube videos as they take m...
by Conrad_R_Hoffman
Wed May 15, 2019 9:58 pm
Forum: General Discussion
Topic: Balancing grinding wheels- my new page
Replies: 22
Views: 506

Re: Balancing grinding wheels- my new page

Saw those, no idea how much they cost. My guess is they could be a bit tricky to adapt the 4-pass technique to, but with some index marks it might not be too difficult.
by Conrad_R_Hoffman
Wed May 15, 2019 8:05 pm
Forum: General Discussion
Topic: Balancing grinding wheels- my new page
Replies: 22
Views: 506

Balancing grinding wheels- my new page

Hot off the press, and in need of comments. Note that there are links to three sound files and one spreadsheet. Tell me what you think... am I off my rocker?

http://www.conradhoffman.com/grindbalance.htm

I noticed two typos, but will wait for comments before correcting them.

Thanks!
by Conrad_R_Hoffman
Thu Apr 11, 2019 2:59 pm
Forum: General Discussion
Topic: machining should square
Replies: 14
Views: 1224

Re: machining should square

Maybe make a cast iron sleeve then use that with some compound to lap the step?
by Conrad_R_Hoffman
Sun Feb 17, 2019 2:09 pm
Forum: General Discussion
Topic: How would you make these adjacent tapers on lathe
Replies: 7
Views: 1144

Re: How would you make these adjacent tapers on lathe

Fortunately it's Delrin, as you'll have to have the tool hanging out a ways.
by Conrad_R_Hoffman
Sun Jan 27, 2019 12:17 pm
Forum: General Discussion
Topic: Is Jet good quality
Replies: 14
Views: 1569

Re: Is Jet good quality

You have to understand what Practical Machinist is- mostly people in commercial machine shops that have zero interest in inexpensive hobby-class machines. Their rules are pretty specific on what can and can't be discussed. I'm basically a hobbyist but usually get along OK there because I stay away f...