The Home Machinist!

Roughing cuts are to remove a large amount of material quickly before finishing, if they cause issues with flex or resonance it's either not appropriate for the job or alternate tooling/techniques are required. I make a Titanium part which reqires a 2" length of 1/4" material to be reduced to just o...

Put it back! It was a safety device to reduce the risks involved in using such a dangerous bit of equipment.

RONALD wrote: ↑

Tue Oct 01, 2019 9:25 am

I have three Harbor Frate Lift tables, and they all have one problem, when you pump them up to a desired height, they slowly go back down.

What happens that makes them safe in the event of a major hydraulic failure?

Buying cheap equipment is a crap shoot, but if you have no pressing need to use it, and can afford the time to sort out a problematic unit if you get one or the cost to replace it if it fails and is badly supported may as well take a punt on the cheap units.

Stamped and formed brackets and panels in Mild Steel exhibit Work Hardening, not Heat Treatment, but annealing them returns them to the soft state losing any additional hardness and rigidity afforded by the Work Hardening.

Mild Steel does not have the Carbon content to allow heat treatment other than annealing when it is work hardened. And yet; The previous owner of my place was a farmer / bricklayer. He left some old tools behind, including some spikes made from re-rod. The pointy ends have been hardened; I can't sa...

The hardness in mild steel automotive panels is work hardening created when they are pressed into shape, there is no heat treat process to put it back. Hmm, was this too complex to impart the information? Mild Steel does not have the Carbon content to allow heat treatment other than annealing when ...

The hardness in mild steel automotive panels is work hardening created when they are pressed into shape, there is no heat treat process to put it back.

I know about the problem with getting them filled. It makes me wonder what people do when they want tanks of compressed air for things other than scuba. Surely you don't have to get certified in order to have a compressed air tank for a workshop. Tank certification requirements depend on a combinat...

SteveHGraham wrote: ↑

Thu Aug 22, 2019 6:13 pm

They're $250 each new, so I suppose I'll be lucky to get $75 for the pair.

They're old tech and need testing, that gives them a value of approximately tuppence and a balloon

What are the advantages of three flutes vs two or four? Polished TC fast helix 3 flutes are pretty much optimum for ally cutting if your machine has the speed, feed and rigidity to use them, more flutes than 2 allows faster feeds and they don't gum up like a 4 flute will if you run optimum speeds.

I use three flute end mills and single flute end mills in Aluminium, all uncoated polished carbide cutters, with flood coolant. Single flute end mills have a helix for chip clearance and are quite easy to sharpen by hand, three flute are better for plunging but for Aluminium spindle speed is king, I...