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Michael, Thanks for the response. The tool was set dead centre which might be part of the problem. I was parting a 57mm diameter piece of cast iron. The overhang might have been too much resulting in

Hello Andrew, It sounds like your parting tool was set too low on the work and was being pulled in and under the work putting excessive stress on the tool post bolt. The parting tool needs to be set

Generally you do the insert yourself. Do you have a drill press or mill? There's various types of inserts, you might be able to get by with a press fit one from the bottom. Something like this (if

I was thinking of seeing if a "helicoil" could work. Of course where do I get it done? More importantly, does the toolpost bolt have to be absolutely square to the surface? Cheers, Andrew

If I remember right from my mechanical engineering classes two full threads of a bolt *should* be all you need. That's assuming the bolt and nut are cut to spec out of proper materials. Other than

G'Day to all, My task yesterday was to work on the cylinder for my Webster engine. I had hogged out the fins, the lower portions and drilled the inner diameter to 13mm. The last operation was to part

M4x8 is a "metric special", i.e. not the standard thread for an M4. But it is available, e.g. the tap is available from Enco: http://www.use-enco.com/CGI/INPDFF?PMPAGE=97&PMITEM=319-5869 Didn't find

Best fit would probably be a BSC (British Standard Cycle) 0.1563 (5/32)" x 32 tpi, 60°. Still available from Tracy Tools in the UK, but probably unheard of on the other side of the pond. Trouble is,

FWIW .8mm Thread is really close to 32TPI. Don't think you'd be able to tell, unless you had a really long piece.

Hmmm - Interesting combination. I measured a 4mm screw at 0.155", so the diameter is right, but the thread is definitely 32 tpi, not the same as the 4mm screw. It's a skinny rod, so there's not enough

The carbide mills I use on our small CNC are made of bacteria sized powder that's been sintered. I don't know if any "solid" carbide is actually cast as one piece. -- Jerry Durand, Durand

Probably metric, M4x8 John

Welcome to made overseas. What I'd do in this case, is run the 8-32 tap in the holes and then tap the new spigots 8-32. I've run into this before. Fool around with some scrap first.. Mert

I need to shorten a couple of gun cleaning rods. Found that the thread was an odd one - 32 tpi (no problem with this) but the OD is 0.153, which falls between 6-32 and 8-32. Machinery's Handbook

my understanding is the material is actually a sintered combination of carbon and tungsten which forms tungsten-carbide particles. Machine tool cutters are formed by combining the particles with a

Mildly so. Not deafening, by a long shot. Just a moderate sound of air escaping. What surprised me was, in 1980 something, it only cost about $200. But, we had to install a refrigerated air dryer to

hilsch vortex cooler. holy smokes! Was it noisy? John B

Most carbide tools are high-temp BRAZED! I, too worked in a machine shop, and ordered many of the tools, including M-5 for some special jobs that could not be cooled with coolant. I, also, ordered,

"The green wheels don't actually grind the carbide, they pull little pieces of carbide away & grind the binder." What binder? Carbide is a sintered material, which means that tiny pieces of carbide

A cheap alternative to a diamond wheel is the diamond knife sharpening blocks sold widely in places like harbor freight for 15$. They have a mix of grits, and are perfectly adequate for sharpening