Search found 736 matches

by Lew Hartswick
Tue Jan 19, 2021 9:56 am
Forum: General Discussion
Topic: Why do I need a Variac?
Replies: 7
Views: 119

Re: Why do I need a Variac?

Where are you ? I have a couple of the medium power ones in the shed. I had two big ones (one a true Variac [rtm] and the other that other Co. :-) ) 240 /120 at 25 A that I sold just last year. They have been in the shed for the 23 years since I retired.
...lew...
by Lew Hartswick
Sat Jan 16, 2021 12:23 pm
Forum: General Discussion
Topic: Should I care - 6.5mm instead of 1/4" DA collet
Replies: 8
Views: 380

Re: Should I care - 6.5mm instead of 1/4" DA collet

:-) "DA" was a haircut style. The first thing that comes to mind when I see it. I really hate abbreviations that aren't accompanied by the full description the first time they appear.
...lew...
by Lew Hartswick
Sat Jan 16, 2021 12:18 pm
Forum: General Discussion
Topic: Boring Head Questions
Replies: 13
Views: 306

Re: Boring Head Questions

Using round bars (in a pair of Vs usually) has been used a lot. At least I've made 4 or 5 tooling devices using it with good results.
...lew...
by Lew Hartswick
Fri Dec 25, 2020 10:21 am
Forum: General Discussion
Topic: Grounding Dust Collector???
Replies: 11
Views: 675

Re: Grounding Dust Collector???

A single "wrap" between the screw is to keep it from being snagged and pulled off. A "mechanical" phenomena not electrical. :-)
...lew...
by Lew Hartswick
Wed Dec 16, 2020 11:13 am
Forum: General Discussion
Topic: From belt drive to chain drive...metal bandsaw. DONE!
Replies: 13
Views: 1145

Re: From belt drive to chain drive...metal bandsaw. DONE!

:-) the quote, < The ship on which I served had amplidynes to control the movement of the main guns.> There is a word I haven't heard since about 1953. :-) the drive for the CPS6B radar set . A monster with 5 one megawatt transmitters and 1, 2 MW one (it was installed while I was working on it) . I ...
by Lew Hartswick
Thu Dec 03, 2020 11:33 am
Forum: General Discussion
Topic: Band Saw Blade Brazing
Replies: 13
Views: 5323

Re: Band Saw Blade Brazing

Here are a couple of "devices" I built just before a new teacher caused me to depart and then the Covid crap came along when the teacher problem was finally solved , and I never got a chance to try them out in practice . :-) https://i.postimg.cc/pT1gL30p/IMG-0549.jpg https://i.postimg.cc/br7WQkfP/IM...
by Lew Hartswick
Sat Sep 26, 2020 9:20 am
Forum: General Discussion
Topic: ER Collets.
Replies: 10
Views: 2264

Re: ER Collets.

That video would probably very helpful IF the guy would have talked slow enough to be understood . So many people seem to be practicing to be auctioneers . :-(
...lew...
by Lew Hartswick
Thu Jul 30, 2020 9:16 am
Forum: General Discussion
Topic: Duburring Raw Stock
Replies: 14
Views: 3462

Re: Duburring Raw Stock

When I was working as an engineer, it was standard practice for the machinists to deburr each and every surface, and I never observed them deburring raw stock for personal safety. I may have just missed it, or the company order in sufficient quantity that they could get deburred raw stock as a matt...
by Lew Hartswick
Mon Jul 27, 2020 8:28 am
Forum: General Discussion
Topic: Has anyone built a guide for a center drill.
Replies: 9
Views: 2881

Re: Has anyone built a guide for a center drill.

Back in ancient times there were machines that you stuck the end of a bar into and they centered and drilled it automatically. You could make an end cap on the lathe, stepped to accept the workpiece and the center drill, and use a hand drill to make a centered hole. I did exactly that a few weeks a...
by Lew Hartswick
Wed Jul 22, 2020 8:23 am
Forum: General Discussion
Topic: single point boring with a drill press
Replies: 4
Views: 1667

Re: single point boring with a drill press

You've just done "line boring" on a simulated Vertical lathe . :-) All that's different is a "steady rest" in place of a tailstock center. :-)
...lew...
by Lew Hartswick
Wed Jul 22, 2020 8:18 am
Forum: General Discussion
Topic: Duburring Raw Stock
Replies: 14
Views: 3462

Re: Duburring Raw Stock

Sheech! It's "raw material". Do you expect the steaks from the butcher to be already grilled? :-)
...lew...
by Lew Hartswick
Wed Jul 22, 2020 8:13 am
Forum: General Discussion
Topic: Split Cotters
Replies: 9
Views: 2216

Re: Split Cotters

They aren't quite as "simple to make" if you cope the ends of cotter to the shaft your clamping. I've done that for the new ones I've made for a Bridgeport quill. I feel that is a better (less marring) thing. It does mean setting up and boring to the right radius.
...lew...