Search found 1253 matches

by John Hasler
Fri Oct 11, 2019 7:29 pm
Forum: Lathes
Topic: Screwcutting not picking up in the same place
Replies: 19
Views: 432

Re: Screwcutting not picking up in the same place

If you are cutting threads with a pitch of 1.75 mm and your leadscrew has a pitch of 3 mm each turn of the leadscrew will cut 1.7143 threads. Thus your threading dial has to account for that ratio by moving one full interval for every .58333 turns of the leadscrew.
by John Hasler
Sun Sep 29, 2019 1:38 pm
Forum: General Discussion
Topic: Phase converter theory question.
Replies: 3
Views: 491

Re: Phase converter theory question.

B Mann writes:
> If the single phase L1 and L2 input to the phase converter wiring is reversed
> will the 3 phase change direction also?

No.
by John Hasler
Fri Sep 27, 2019 9:58 am
Forum: The Junk Drawer
Topic: Metal type for heat treating?
Replies: 2
Views: 284

Re: Metal type for heat treating?

The black is usually just a surface finish such as hot oil. It doesn't tell you anything about the type of steel or how it has been processed.
by John Hasler
Tue Sep 24, 2019 1:01 pm
Forum: Lathes
Topic: Unknown lathe
Replies: 13
Views: 809

Re: Unknown lathe

Try to find nameplates on the toolchests.
by John Hasler
Sun Sep 22, 2019 1:02 pm
Forum: General Discussion
Topic: Vise Squad
Replies: 14
Views: 1413

Re: Vise Squad

A screw or nut that fails before the elastic limit of the jaws is reached is a feature, not a bug, but other than that I don't really see that the ultimate failure mode of a vise when it is abused is relevant. How much it flexes at rated load and how much play there is in the moving jaw seems much m...
by John Hasler
Sun Sep 15, 2019 8:33 pm
Forum: The Junk Drawer
Topic: Engineers really know their stuff
Replies: 152
Views: 34630

Re: Engineers really know their stuff

SteveHGraham writes: > It is ASTOUNDING that Microsoft is this inept. They don't need to be ept, since almost everyone believes that they have no choice but to use Microsoft software no matter how bad it is. Most people also don't know how bad it is, having never seen anything else. > I wonder if an...
by John Hasler
Sat Sep 14, 2019 8:30 pm
Forum: General Discussion
Topic: Periscope films
Replies: 14
Views: 1875

Re: Periscope films

>Yes they may own the medium on which the documentary is displayed. To clarify, when you view one of their films on Youtube the medium on which it is displayed is your computer, which you own. What you are looking at is a copy which you made with their permission. If they own a copyright on the item...
by John Hasler
Fri Sep 13, 2019 10:16 pm
Forum: General Discussion
Topic: Periscope films
Replies: 14
Views: 1875

Re: Periscope films

choprboy writes: Want a copy without paying Periscope? Just copy it off Youtube. You will not infringe any copyright by doing so. Well.. that is a bit more tricky... Because Periscope has slapped their logo and timestamp over the top, the Youtube video is now a derivative work and potentially (I th...
by John Hasler
Fri Sep 13, 2019 6:25 pm
Forum: General Discussion
Topic: Periscope films
Replies: 14
Views: 1875

Re: Periscope films

jcfx writes: I'm not sure how Periscope Films worked out the rights for Gov't films... They didn't. There are no rights to work out. Works of the US government are in the public domain. choprboy writes: Want a copy without paying Periscope? Just copy it off Youtube. You will not infringe any copyrig...
by John Hasler
Wed Sep 11, 2019 5:47 pm
Forum: Riding Scale Railroading
Topic: Battery Life
Replies: 6
Views: 868

Re: Battery Life

I have heard that you must not place batteries directly on a concrete floor, but to place them on wood supports. Long ago lead-acid car batteries were built using three-hole hard rubber extrusions which were sealed at the bottom with pitch. This stuff could be slightly porous so that a bit of acid ...
by John Hasler
Mon Sep 09, 2019 7:33 pm
Forum: General Discussion
Topic: Vertical Band Saw: Useful?
Replies: 25
Views: 3648

Re: Vertical Band Saw: Useful?

My vertical bandsaw (used to be a horizontal) is one of the most used machines in my shop.
by John Hasler
Sun Sep 08, 2019 5:57 pm
Forum: Lathes
Topic: Lathe Fixed.
Replies: 7
Views: 889

Re: Lathe Fixed.

There probably is enough lubrication when the lathe is run at rated speed. The manufacturer's error was in failing to anticipate the development of VFDs.