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Old 08-04-2010, 07:45 AM   #1
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Default How to drill hole on the spur gear?

I been trying to drill holes on the mugen spur gear,to lighten it up.Notthing sings to be work.That gear is just soo hard,and kill the bit almost right a way. I have tryed diff kind of bits what I could find in hardware and tool stores .I am using drill press with low rpm plus using cooling cut fluid to.I wondering if anybody knows what is the right way or the right bit .thanks!
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Old 08-04-2010, 08:12 AM   #2
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you need a bit harder then the metal you're drilling..the ring gear is most likely hardened so you'll need tool steel or spring steel....good luck
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Old 08-04-2010, 09:13 AM   #3
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Take it to a machine shop and let the pros do it for you. The last thing you want is something that turns that many RPMs out of balance.
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Old 08-04-2010, 09:37 AM   #4
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If you have a drillpress then just bolt the slamp on the table, find a piece of round material fitting the hole of the gear and mount it in the clamp outside the center of the drillbit.
With the gear on it you kan drill the hole and turn the gear to the next position.
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Old 08-04-2010, 09:38 AM   #5
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You right about the ballance ,of corse if I do I do it the right way keep the balance ect...I can do it I just can't find a right bit ...never seen hard material like this spur gear...no wonder why is it 40 $..lol..Thanks!
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Old 08-04-2010, 09:40 AM   #6
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Thanks Roelof!I'll give a shot!
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Old 08-04-2010, 11:14 AM   #7
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These parts are tempered and will be near impossible to drill into.
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Old 08-04-2010, 01:18 PM   #8
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I know Savoya does (or somebody does for him) .I just want to know how....
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Old 08-04-2010, 02:39 PM   #9
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Gabe- give it to Mike Troxler at the indoor track in G-Boro. If anybody in your area can do it he can. He could either do it or get you a bit. If it's that hard, the bit will probably cost more than the gear, lol.
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Old 08-04-2010, 02:56 PM   #10
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You can use either a carbide drill or , if you have access to a Bridgeport, a carbide end mill.


Or, send it to me.
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Old 08-04-2010, 03:12 PM   #11
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Quote:
Originally Posted by gabor szilagyi View Post
I been trying to drill holes on the mugen spur gear,to lighten it up.Notthing sings to be work.That gear is just soo hard,and kill the bit almost right a way. I have tryed diff kind of bits what I could find in hardware and tool stores .I am using drill press with low rpm plus using cooling cut fluid to.I wondering if anybody knows what is the right way or the right bit .thanks!
You need a solid carbide bit. They are pretty spendy though. The ones I get are from McMaster Carr and cost about $30.00.
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Old 08-04-2010, 03:30 PM   #12
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Ok thank you guys!
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Old 08-04-2010, 06:21 PM   #13
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What size do you need? I may have one lying around.

PM me.
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Old 08-04-2010, 06:46 PM   #14
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Cobalt are also very hard and do great at cutting hard metals.
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Old 08-04-2010, 06:57 PM   #15
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It might help to drill a small pilot hole first then come back with a bigger bit.
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