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Old 05-05-2004, 03:43 AM   #1
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Default AL4 or AR4 Diamond Tipped lathe bits?

Anyone know where I can find these at a decent price. I found them at McMaster car for around $60. There are some on ebay for around $50 so I know there has to be a place to get them for $40 or so.

Any suggestions?
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Old 05-05-2004, 06:23 AM   #2
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Those are pretty much the best prices I have seen.

I have ordered online from i believe the guy who sells the bits ( I don't think anyone else does ) and he ships prompt and is very helpful, but make sure you know what bit you need first as he told me the wrong one ( I am lucky, I can use either side ).

Honestly, I wouldn't get a diamond bit, better to invest in a diamond file and sharpen the bit. Very easy to do and it works great, the files are cheap too and the guy who sells the bits mainly on ebay also sells the files.
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Old 05-05-2004, 10:20 AM   #3
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I bought 2 carbide AL4 bits for $4.15ea. and a diamond file for $6.00 at a local tool supply store. Just keep the carbide bits sharp and they work great.
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Old 05-05-2004, 11:13 AM   #4
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Yeah... I think carbide is going to be easier on the wallet.

Anyone try these yet? Micro 100 AL4 Tool Bit

"Super Carbide" ... or something like that.

I did get a price of $54 for a PCD (polycorbonate diamond) tipped AL4 bit from "J&M Diamond Tool". Probably cheaper from them if you buy more than one.

What grit diamond file do you use with your carbide bits?

About how many comm turns do you get before it needs sharpened?
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Old 05-05-2004, 12:53 PM   #5
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I use both a 180 grit and a 260 grit file. I do 180 first then 260 to smooth it out, if I am lazy I just do 180. From what I was told the best is 200 grit, but 180 does the job, my comms shine like a mirror .

I usually do up the bit everytime before I do a comm cutting session, which could be about 4 comms in various conditions, but that is just me. You probably could go longer if you want and it doesn't take that long to sharpen, I take maybe 2 minutes and give the bits a once over.


much better than chipping a diamond and being out all that money.
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Old 05-05-2004, 02:08 PM   #6
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Do you just file the side and bottom edges (not the top correct)? Does it matter which direction you file them... should I stroke away from the edges or towards them?

Do you drag the file across the bit or the bit across the file or does it even matter?

I'll try to track down a 160 or 200 grit file. Any links? Big Jim suggested a 400 and 600 grit file... isn't that a LOT finer grit?
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