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[machinist] Diamond surface grinding wheel | PM Thread
- From: Lawrence London <lfljvenaura@gmail.com>
- To: machinist@lists.ibiblio.org
- Subject: [machinist] Diamond surface grinding wheel | PM Thread
- Date: Thu, 20 Jul 2017 16:26:53 -0400
Diamond surface grinding wheel | PM Thread
http://www.practicalmachinist.com/vb/general/diamond-surface-grinding-wheel-139034/
Thread: Diamond surface grinding wheel
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02-24-2007, 10:52 PM #1
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I have a surface grinder that has what I think is a diamond grinding wheel. The wheel appears to be partially loaded with some substance that may be affecting it's performance. How would you true up or clean a diamond grinding wheel? The only name I can find on it is a diamond shape followed by USDW, then a bunch of letters and numbers. Thanks.
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02-24-2007, 11:55 PM #2
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What leads you to believe it's a diamond wheel? What are you trying to grind on the wheel?
Post the letters and numbers. Superabrasive wheels are not usually a solid wheel. They're bonded to the edge of metal, or otherwise have a thin layer of abrasive with a large core of nonabrasive material.
Wheels with a normal abrasive should take the following form:
Prefix - Abrasive - Grit - Grade - Structure - Bond - Suffix
example:
R - A - 40 - G - 10 - V - 843
R is a letter the manufacturer decided to use. A is the abrasive type, which stands for Aluminum Oxide (C is silicon carbide). 40 is the grit size of the abrasive (Higher number is finer grit). G is the grade, or how strong the bonding agent is and how readily it will decompose (A is soft, Z is hard). 10 is the structure, or porosity of the wheel (1 is dense, higher numbers are more porous). V is the bond type, or the kind of material used to bond the abrasive (V is a vitrified bond, the most common kind).
For superabrasive wheels (Diamond and CBN) the formula differs slightly:
</font>- Prefix - Abrasive (B or D)</font>
- Grit</font>
- Grade</font>
- Abrasive concentration - Usually from 25 to 100. Low numbers means low concentration of abrasives.</font>
- Bond</font>
- Bond modification - Sometimes the bond is modified to work better in a specific superabrasive application. This is manufacturer dependent.</font>
- Abrasive depth - Thickness of the wheel's abrasive layer. Specified in fractional inches or mm.</font>
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02-25-2007, 12:41 AM #3
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The wheel is only .25 wide and has a metal hub, the abrasive part is about .20 thick. The wheel is used to grind quartz, .003 thick, glued with wax into .5" long lengths. I am away from work, so I can't give you the numbers off the wheel. One number I found interesting though was 22 1/8. Written that way. I will be back to work in the AM and will check the numbers. Thanks. My company is really bad about documenting stuff like what wheel this is and where it came from. They may have had this wheel for 20 years.
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02-25-2007, 02:12 AM #4
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Yeah, that sounds like a diamond wheel. Glad to see you aren't trying to grind steel, like a lot of people try to do with diamond.
Also, I forgot to mention. There are specific dressing sticks for diamond wheels. They're made of aluminum oxide or silicon nitride. -
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02-25-2007, 02:26 PM #5
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Try Nortons N 5468779 89A 1206 4A V2 for dressing and cleaning the crud out of diamond wheels. 1"x 1" x 6"
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02-25-2007, 02:40 PM #6
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To put a slight hijack on the topic, I'm in the market to get a carbide grinder, and want a diamond wheel for it.
How does the abrasive concentration affect performance?
Is it strictly wear rate, or is it also cutting rate & finish quality? Clearly, it's about cost as well -- lower % concentration wheels are less expensive. -
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02-25-2007, 03:52 PM #7
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Is it wax gummed up on the wheel? Try a good solvent to disolve the wax? JRoucheThe wheel is used to grind quartz, .003 thick, glued with wax into .5" long lengths. -
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02-25-2007, 04:55 PM #8
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We used molybdenum blocks to dress diamond. If you need to do a lot of dressing, a brake dresser works very well. If the wheel hasn't been damaged and just needs cleaned up, the Norton sticks, as Arnie3 mentioned, do a good job.
Kevin -
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02-25-2007, 04:56 PM #9
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The wheel has the following on it: USDW MD320 N50 BB 22 1/8 34JD-74. I have some dressing stones from another machine that I will try on the stone. I don't think the wax build up is a problem, but I might try some solvent on it if the dressing doesn't work.
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02-25-2007, 05:41 PM #10
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"Fixing" a diamond wheel is a 2 step process. Dressing and conditioning. Dressing is getting the wheel to run true and round. Conditioning is getting the resin bond back far enough to let some diamond particles stick out far enough to do some grinding. On a surface grinder a brake dresser is quick and easy,the moly blocks joeby mentioned in his post work too. I use a lot of diamond and CBN wheels on Heald ID grinders to grind plasma spray on overhauled gas turbine parts. They range from 1/2" to 3" dia and when they get worn on the "front" blind bores get small in the bottom. Flipping them over sometimes works but usually I grind them straight. Mount the wheel in a good whirlygig on a surface grinder or between centers on a arbor in an OD grinder and with a 60 grit green wheel grind it straight. For blind bores I usually put some taper in them(.001 an inch),wet is best but dry will work. Carefully wrap one layer of masking tape tightly around the outside of the wheel and indicate it in w/n .0005. The tape will save your indicator points. Condition with a soft alum oxide stick or a peice of white wheel,just hold it against the wheel for a second or two while it is running. The less you "condition" the better the finish but the wheel is much less aggressive.
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02-25-2007, 06:15 PM #11
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Well it looks like we are successfully grinding parts. Part of the problem turned out to be a sticky feed wheel. Made the feed jerky and destroyed the stacks of parts. Thanks for the help.
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02-26-2007, 01:51 AM #12
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If it is running reasonably round you will be ok just forcing an abrasive stick or old grinding wheel into it free hand. You are flood cooling I assume ? Look at it with a magnifying glass. The diamons should have a little tail of bond behind them. Good luck.
SM
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- [machinist] Diamond surface grinding wheel | PM Thread, Lawrence London, 07/20/2017
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