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Thread: Pre-relieving cutting edges
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1st Dec 2015, 11:11 PM #1Diamond Member
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Pre-relieving cutting edges
Invariably when I make a cutting tool I create the cutting edge and then spend time carefully trying to relieve the edge without damaging it.
I needed a 35° inc angle reamer, this time I got a bit smarter, cut the reliefs first and then cut the flutes.
This is a piece of 20mm 1020, I've put 6 flats on it much like sharpening a pencil.
I've turned the job 30° in the collet block and cut the flutes.
Harden with cherry red hardening powder.
The reamer works well, the surface finish is OK for what the part needs to do.
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2nd Dec 2015, 11:00 AM #2Golden Member
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Are you sure that it is 1020? I am surprised that it cut that well as 1020 has only around .2% carbon and is generally not suitable for flame hardening.
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2nd Dec 2015, 01:09 PM #3Banned
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Techo.
Bob's the Australian agent for Cherry Red. A case hardening powder. He mentioned it between the 2nd & 3rd picture.
He left some sample pots down here, when he was here last. I still have 3 left. Sing out if you want to try it.
Regards Phil.
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2nd Dec 2015, 03:33 PM #4
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2nd Dec 2015, 03:41 PM #5Golden Member
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Yes Phil, I missed the fact that he was referring to the Cherry Red product, I thought it was a reference to the hardening temperature/colour. I have never used any of the case hardening powders so I might take you up on the offer of a sample pot.
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2nd Dec 2015, 07:18 PM #6Banned
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I reckon Bob should do a youtube vid of the "cherry red" process.
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2nd Dec 2015, 08:52 PM #7
Whats funny is cherry red is a misnomer, at least these days. Back when the phrase was coined the cherries were far lighter than they are today.
Nice work by the way Bob, i have used my cherry red a few times and it's great.1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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2nd Dec 2015, 08:55 PM #8Banned
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Techo.
Your mail box is full.
Techo1 has exceeded their stored private messages quota and cannot accept further messages until they clear some space.
Regards Phil.
(on edit) And if you don't get any, ping me with an email. Its in my profile
I suspect there's a Cherry Red / Dumpling lunch for the North West contingent tomorrow.
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2nd Dec 2015, 09:44 PM #9Diamond Member
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Here you go. https://www.youtube.com/watch?v=9tlsq2ESQz0
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2nd Dec 2015, 10:29 PM #10Most Valued Member
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Thanks for the youtube clip Bob, looks like a good product. What is the price for a small container and can it be posted through Australia Post?
Kryn
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2nd Dec 2015, 11:17 PM #11Banned
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3rd Dec 2015, 12:14 AM #12.
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Being an out of towner means I'll probably have to take my chances on eBay - Cherry RED DIY Surface Harding Powder 400gm 14 Ounces | eBay
(The stuff looks far more promising than the Kasenite that's eaten its way through the tin container I bought it in about twelve years ago.)
BT
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3rd Dec 2015, 12:27 AM #13Banned
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3rd Dec 2015, 12:52 AM #14.
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Thank you Phil and Bob.
Bob.
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3rd Dec 2015, 10:56 AM #15
Only one size available.
How long would 400gms last, or I should say, would 400gms last me as long as I am thinking it will?
I think I will look into it and maybe get some.
Dean
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