Search found 17806 matches

by Harold_V
Mon Jul 13, 2020 1:50 am
Forum: The Junk Drawer
Topic: TX650 build.
Replies: 26
Views: 488

Re: TX650 build.

Heh! I realized I could benefit by owning machines when I got most of the parts for a Doodle Bug when I was a young teenager--early 50's. (Anyone remember the Doodle Bug?) My fate was sealed (to become a machinist) when I saw the movie The African Queen and fell in love with steam power. My only bik...
by Harold_V
Sat Jul 11, 2020 4:26 pm
Forum: The Junk Drawer
Topic: TX650 build.
Replies: 26
Views: 488

Re: TX650 build.

The basic theme of the forum in which this thread was originally placed (General Discussion) is machining. It is not a motorcycle forum, with precious little of the content placed in the original post related to machining. We do not discourage readers from making comments that may or may not pertain...
by Harold_V
Sat Jul 11, 2020 3:04 am
Forum: General Discussion
Topic: Grinding a tool for 316 SS
Replies: 8
Views: 303

Re: Grinding a tool for 316 SS

Allen, My lathe is a 12" Graziano, with a natural gap, so it is capable of turning about 18" (in the gap). It is powered by a three horse motor, and weighs about what your lathe does. I truly believe you have enough power and rigidity to use negative rake, and it's an absolute wonder when it comes t...
by Harold_V
Fri Jul 10, 2020 4:20 pm
Forum: Live Steam
Topic: Harbor Freight Jack Stands Recall
Replies: 16
Views: 1842

Re: Harbor Freight Jack Stands Recall

One of the positive experiences I've had at Harbor Freight was the purchase of a set of combination wrenches. How often does one expect to use sizes between 1¼" -2"? Rarely, in my experiences, but the need does arise. About 20 years ago I purchased a set for $30. They display the same quality as wre...
by Harold_V
Fri Jul 10, 2020 1:59 am
Forum: Build Log
Topic: A Real Dirty Job
Replies: 165
Views: 77192

Re: A Real Dirty Job

Do not use cold rolled steel here if you are going to start with a solid block as the offset part is long and thin and will warp badly as most of metal will be machined away in the process. That condition is easily addressed by proper roughing and finishing. When one takes balanced cuts, alternatin...
by Harold_V
Fri Jul 10, 2020 1:42 am
Forum: General Discussion
Topic: Grinding a tool for 316 SS
Replies: 8
Views: 303

Re: Grinding a tool for 316 SS

I'm not surprised, Greg. That's typical of how carbide responds when not applied under the best of conditions. They're particularly bad on most engine lathes, as the tailstock is rarely in true alignment with the spindle. The spotting drill is not pointed at the center, but at a small area beyond ce...
by Harold_V
Wed Jul 08, 2020 4:06 pm
Forum: General Discussion
Topic: Grinding a tool for 316 SS
Replies: 8
Views: 303

Re: Grinding a tool for 316 SS

It's not secret that 300 series stainless alloys respond quite nicely to positive rake. It's tough (due to the high nickel content) so the cut benefits by the extreme rake angle, which lowers cutting pressure. If you balance the relief with the rake angle, the tool will remove metal quite well, albe...
by Harold_V
Wed Jul 08, 2020 3:06 am
Forum: General Discussion
Topic: Turning Hot Rolled Mild Steel
Replies: 7
Views: 266

Re: Turning Hot Rolled Mild Steel

Yep! It's generally a mistake to turn from a chuck with a center, and for that very reason*. If the piece you make is slender, you also risk making a part that is straight while in the machine, but is not when removed. To add to the insult, the center is most likely not going to be concentric with t...
by Harold_V
Wed Jul 08, 2020 1:32 am
Forum: The Junk Drawer
Topic: Mesmerizing or distasteful?
Replies: 6
Views: 245

Re: Mesmerizing or distasteful?

It may not achieve the desired goal, however, that being to flatten a surface. It would be interesting to know more.

H
by Harold_V
Mon Jul 06, 2020 10:07 pm
Forum: General Discussion
Topic: Home Made Rotary Broach.
Replies: 3
Views: 221

Re: Home Made Rotary Broach.

Well done! It's amazing the things one can do with just a little imagination.

H
by Harold_V
Mon Jul 06, 2020 2:59 pm
Forum: General Discussion
Topic: Mitutoyo mechanical digital micrometer mechanism stiff
Replies: 3
Views: 175

Re: Mitutoyo mechanical digital micrometer mechanism stiff

No experience with those micrometers, but I have had a negative experience with micrometers that have been stored too long and the oil has appeared to have polymerized. Why some do and some don't remains a mystery to me, but that's the reality. What I've learned is that once it happens, good cleanin...
by Harold_V
Mon Jul 06, 2020 1:17 am
Forum: Home Shop CNC
Topic: G0678 CNC Conversion Build Log
Replies: 56
Views: 36822

Re: G0678 CNC Conversion Build Log

Please note that Dave has gone silent as of March of last year. He most likely won't respond to your question.

H