Search found 1805 matches

by tornitore45
Fri Feb 28, 2020 8:00 am
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 21
Views: 3913

Re: Potting electrical coil in steel

I can only offer my experience with power transformers in the 200W range. We used a type of epoxy resin, gray, typical epoxy smell with the viscosity of warm honey. We did not pull a vacuum except for HV transformers. If you have the capability to pull a vacuum it may help to seal any inflow of oil....
by tornitore45
Fri Feb 21, 2020 7:13 am
Forum: General Discussion
Topic: hardening and tempering
Replies: 20
Views: 3921

Re: hardening and tempering

See this

viewtopic.php?t=32919

You do not need to buy one, is just a tube you drop a steel ball, the higher the bounce the harder the piece.
by tornitore45
Thu Feb 20, 2020 7:55 am
Forum: General Discussion
Topic: hardening and tempering
Replies: 20
Views: 3921

Re: hardening and tempering

It's not like such a mistake would destroy a Mars probe...
Never happened before.... they built the pyramids.
by tornitore45
Wed Feb 19, 2020 2:09 pm
Forum: General Discussion
Topic: hardening and tempering
Replies: 20
Views: 3921

Re: hardening and tempering

Are we sure we are not confusing Celsius with Fahrenheit?
by tornitore45
Wed Feb 19, 2020 11:34 am
Forum: General Discussion
Topic: hardening and tempering
Replies: 20
Views: 3921

Re: hardening and tempering

I agree with Russ about 600C taking most of the hardness out. Small parts that need no soaking can be tempered by color. Polish to show bright metal + heat with torch on the side that you want less hard + look for the color to travel from the torch side to the tip + quench when the color you want re...
by tornitore45
Fri Feb 14, 2020 9:50 am
Forum: General Discussion
Topic: Parting tool holder
Replies: 39
Views: 7936

Re: Parting tool holder

Banggood's search on their website is awful. Is not just Banggood, there are many companies that do not understand the issue. Parts that are mostly characterize by dimensions need to have a dimension selector. I do not want to look 97 pages of randomized ball bearings or gears to find the one I nee...
by tornitore45
Fri Feb 07, 2020 2:47 pm
Forum: Lathes
Topic: Change lead screw to metric?
Replies: 29
Views: 7586

Re: Change lead screw to metric?

Bummer! You could have used the carriage to make some of the slot depth parallel to the axis and then use the compound for the bottom inclined surface
by tornitore45
Fri Feb 07, 2020 1:49 pm
Forum: General Discussion
Topic: Mill and Lathe Recommendations for High School Machine Shop
Replies: 19
Views: 3439

Re: Mill and Lathe Recommendations for High School Machine Shop

Many have made negative comments on 3 in 1 machines. In addition to all the negatives the long and constant requirement to change set up is even more of an impact when the class is time limited. The student will spend 1/2 the class to reconfigure the machine. The genial idea is to let some machines ...
by tornitore45
Thu Feb 06, 2020 1:08 pm
Forum: General Discussion
Topic: What is the difference.....
Replies: 11
Views: 1770

Re: What is the difference.....

John Hasler type faster than I.
by tornitore45
Thu Feb 06, 2020 1:07 pm
Forum: General Discussion
Topic: What is the difference.....
Replies: 11
Views: 1770

Re: What is the difference.....

The question is not clear, if I guess correctly A rotary phase converter is an oversized 3 phase motor powered with one phase. It will not self start like any induction motor missing the starting winding will not start. It will buzz undecided whether to spin CW on CCW because of inherent simmetry. O...
by tornitore45
Thu Feb 06, 2020 8:18 am
Forum: Lathes
Topic: Change lead screw to metric?
Replies: 29
Views: 7586

Re: Change lead screw to metric?

But I have to cut the keyway with a [gasp!] file. I have only done it twice in aluminum but consider drilling a small hole to remove most of the metal and then use the lathe as a shaper. Locked Chuck, Tool on the tool post ... in and out advancing the cross slide a couple of thousand at the time. I...
by tornitore45
Thu Feb 06, 2020 7:41 am
Forum: General Discussion
Topic: Single vs double end end mills
Replies: 13
Views: 3149

Re: Single vs double end end mills

John, I do not see any source where a double cost less than a single. A double cost usually less that TWO single.