Search found 45 matches

by JeffinWIS
Sun Feb 18, 2007 10:50 pm
Forum: General Discussion
Topic: Had a crash
Replies: 7
Views: 1831

Jim, it looks like the slot is wider than the end mill? And you were milling each side separately? And milling in the "Y" axis (saddle in/out)? Climb milling? With the table locked and conventional milling each side, I think you can mill that slot without much problem.
by JeffinWIS
Sun Feb 11, 2007 9:28 am
Forum: General Discussion
Topic: Guestion on 3 jaw slipping on thread protectors
Replies: 8
Views: 1854

I'd chuck the bushing with the cut-off side out, take a light facing cut and c'sink it.
by JeffinWIS
Fri Feb 09, 2007 9:32 pm
Forum: General Discussion
Topic: Small Center Drill Blues
Replies: 17
Views: 4032

I've got to go with Jim's #6...Use a spot drill when ever you can. It's just the way I was taught 30+ years ago at Giddings & Lewis...use a spot drill for "spotting" holes (going a little deeper will chamfer the hole at the same time)...center drill is for making a hole for a lathe center. In their ...
by JeffinWIS
Fri May 26, 2006 11:06 pm
Forum: General Discussion
Topic: Gear measuring vernier- Starrett 456?
Replies: 3
Views: 1100

Starrett goes down to 20DP according to their 1998 catalog
by JeffinWIS
Wed May 03, 2006 3:16 am
Forum: The Junk Drawer
Topic: Guys, what mfr makes a quality lever ball valve ...
Replies: 12
Views: 3396

The local Menards home center has them in the plumbing dept. Nice, brass, stainless steel "ball" riding in some sort of white plastic.
by JeffinWIS
Fri Apr 07, 2006 10:47 pm
Forum: Milling Machines
Topic: Boring Head
Replies: 29
Views: 7925

Precision boring is a demanding task, made painfull if fighting a junk boring head. A GOOD 3-inch head with a 3/4" holes will let you do a lot of work AND get some enjoyment out of it :D Check these sites... http://www.criterionmachineworks.com/ http://www.flynnmachine.com/ I've use both, and both a...
by JeffinWIS
Thu Apr 06, 2006 2:47 am
Forum: Lathes
Topic: Can old files be ground into lathe cutters.
Replies: 24
Views: 4331

You can do it, Pooh. Files are plenty hard for cutting off most stuff the average guy uses. Keep the RPM's down when cutting off and the edge will last quite a while. Biggest problem will be making it! Lots of teeth that need to be ground off. The sides of the blade should be tapered also, smaller a...
by JeffinWIS
Mon Mar 27, 2006 11:06 pm
Forum: General Discussion
Topic: carbide boring bars
Replies: 9
Views: 1541

5-1 and 10-1 is probably a fair general rule. A lot depends on what you want to do. We use 2" bars a lot on lathes. On roughing cuts, up to 1/4" deep, 4-1 is about the limit. On a mill, where most of the boring is finishing only, the numbers change some. On the small bars, the cuts are probably very...
by JeffinWIS
Mon Mar 27, 2006 5:42 pm
Forum: General Discussion
Topic: Finishing Brass
Replies: 6
Views: 1572

I'de use a minimum 1/32" nose radius on the tool. Stone the radius and the top surface. A "fine india" stone works. Use at least .005" feed per rev. Very slow feed rates tend to do more rubbing than cutting, which doesn't give the best finish. RPM is determined by the diameter of the part and the cu...
by JeffinWIS
Mon Mar 27, 2006 5:30 pm
Forum: General Discussion
Topic: carbide boring bars
Replies: 9
Views: 1541

Jim's got it. The heades are brazed or silver soldered on. The carbide ar is MUCH more rigid than a steel bar, allowing much more "stand out" without chatter. They are unforgiving of even very minor "crashes", snapping nicely into several pieces.