The Home Machinist!

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.

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.

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.

Try to find nameplates on the toolchests.

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...

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...

>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...

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...

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...

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 ...

My vertical bandsaw (used to be a horizontal) is one of the most used machines in my shop.

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.