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RPM isn't the only factor, feedrate is also part of the calculation. And taking shallow cuts are going to show less of a difference than deeper passes. Paul [email protected]> wrote:

Further about cutting speeds.? Here is a block of aluminum, with 1/4" wide grooves that I cut.? ?The 2 grooves to the right are at the Cowells highest speed, maybe 5000.? The left is with the

Thanks everyone. I’ve ordered a ‘normal’ grit cup wheel to fit on the U3, to go with the diamond wheel. I’ll also make an accurate sliding rest / guide for the non-whetstone end of the bench

I don’t know to what accuracy you want to shape your tools, but the old hands here (not me, im an old beginner) often sound off about lesson number 1, or close to 1, is ‘learn to grind your own

Jim,I am in Minnesota also.Just curious, what part of Minnesota do you live?I am in Buffalo, MnDick

For any grinding on the Unimat lathe, I usually just cover the rods and bed with plastic wrap.

You will, even if you take great pains to shield and protect everything you can. If you only do it once in a great while, and are anal about protecting the machine, you may never notice the

Jim, I updated the drawing to show the correct position of the eccentric. You may have to refresh your browser to get the new photo. Eccentric sketch. (

You can machine HSS. You need something harder than the HSS to machine it. Carbide & diamond come to mind. Some nitrides, too. Grinding is a machining process. Grab one of your HSS blanks, and look at

A U3 is all I have...?? good job I waited before rushing into the workshop and trashing things! Ah, presumably the aluminium oxide cutter is courser (what grit is it?) and more rapid cutting than

Indeed. I did not mean to say it is machinable on a unimat. If that was the intention, then the answer is no way jose. Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________

I have machined pre-hardened steel with a carbide cutter on a study CNC machine. To do anything like this you need something 1000x stronger than a Unimat. The simple answer is no you can't machine it.

Andrei,Have you ever done it?

You can still do it. I posted a video of a guy using his cnc and a carbide bit to machine an hss bit into a form tool. Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________

Andrei, The question was can you machine a HSS tool bit with an end mill. Not tool sreel. Dick -- http://www.homemadetools.net/ forum/ OFF- SET-tailstock-center-65965#post105972

Machining hss video https://youtu.be/rRkjVcmjhuc?si=2Plk76ImYj2FU8dG Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Wednesday, September 11, 2024 8:41:56 AM To:

Peter, You can’t rough it a HSS tool bit using an end mill. Your best option is to grind it by hand on a bench grinder. I have two grinding wheels. One is a flaring cup aluminum oxide wheel 4”

Yes, you can machine tool steel using a carbide endmill. Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ Sent: Wednesday, September 11, 2024 8:09:12 AM To: Carl

It’s been a while since I’ve posted a dumb question (your view may differ!) so here is one… I don’t have a decent bench grinder, or, at least, it doesn’t have accurate guides*. I do have a

Just a couple of things to note. The eccentricity is not dimensioned on the drawing, but everything points to it being 10 mm, so a 20 mm throw. Also note the radial hole just visible in this picture: