The Home Machinist!

6000 fpm is correct for a vitrified wheel 6000 x 4 / 30 = 800 rpm Peter I was just digging into the math when I saw your reply. Here's what I got: 30" diameter wheel is 2.5 foot diameter wheel. RPM = FPM / (Pi * Diameter) RPM = 6000 / (3.14 * 2.5) RPM = 764 RPM Rule of thumb method you used wa...

In my opinion buying used grinding wheels is like buying used underwear,,,,not a good idea. ... (this is on a typical HF bench grinder, 6 inch wheel) a large piece hits the friend in the face,,, from lip to fore head, taking out his eye... just food for thought as accidents happen. Thank you for yo...

I strongly suggest you lose the idea of a variable speed grinder unless you have a death wish. Vitrified grinding wheels, in general, should be operated at roughly 6,000 SFPM. If you overdrive a wheel, which would be easy with a variable drive, you risk the wheel coming apart. People usually die wh...

The bloke is good at expressig himself non-verbally.

Grinding wheel questions, or "Real men have big grinding wheels." ?? I have acquired an assortment of big grinding wheel "leftovers" from a local factory. Worn down beyond where the factory can use them, but plenty of grind left to them. They measure in at about 30" OD, 12&q...

Will this be operational, or decorative?

Either way, it looks like a lot of fun!

PeteH wrote:BTW - Another reason for using a flat belt is that, if you screw up, the belt will slip and thus will protect the machine (and you). The sprocket-and-chain won't; and if that happens, things will break.

Belt wins for sure! I'm mighty human and need a BIG eraser.

I think The Henry Prentiss Company is a machinery dealer. I'm 99.999% sure that's a 1915-1927 Lodge and Shipley. Should be cast in the front side of the bed at the tailstock end. ... I went and looked, you are correct. Thank You! What a wonderful job you did restoring yours! The 5hp motor you are p...

Here I am, another new guy, anticipate a flood of questions. Well, not so new at 41, but not old yet either. I’m a computer programmer, working mostly with Microchip series microcontrollers and PC programming to interface to them. If you want to read a bunch more about me, feel free to have a look a...