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Author Topic: Recommended RPMs for drilling balls  (Read 10897 times)

qstick777

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Recommended RPMs for drilling balls
« on: May 30, 2010, 01:35:37 PM »
I think the number is right around 500, is that correct?

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qstick777

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Re: Recommended RPMs for drilling balls
« Reply #1 on: June 02, 2010, 10:41:55 AM »
Wow, nobody?  


Jayhawk has this listed for it's Tri Oval Mill press:

 
quote:
Do I need special bits for drilling oval holes??
NO!! Those special end mill bits are very expensive. Jayhawk manufactures our own drill bits specifically for drilling bowling balls. Used the proper way, they will provide the same accuracy in cutting oval holes.  Like any cutting tool, it is very important that the bits be kept sharp at all times. The speed that is used is also very important. Jayhawk recommends a cutting speed of 450 to 500 RPMs. Remember that the faster the bit is turning, the more friction and heat is created, reducing the life of the bit.



I've seen drills that go from 200-3000+.  Is there a recommended minimum speed and/or a maximum speed? You know, at least xxx RPM, but not more than yyy RPM.

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Pinhammer

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Re: Recommended RPMs for drilling balls
« Reply #2 on: June 02, 2010, 02:14:36 PM »
I think mine is set at 650
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Gunny

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Re: Recommended RPMs for drilling balls
« Reply #3 on: June 02, 2010, 03:01:29 PM »
mine is set at 500
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azguy

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Re: Recommended RPMs for drilling balls
« Reply #4 on: June 02, 2010, 06:44:54 PM »
Mine's set at 470
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qstick777

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Re: Recommended RPMs for drilling balls
« Reply #5 on: June 03, 2010, 11:22:44 AM »
Thanks guys.  This is for somebody that asked me via PM.  My press was already setup, and didn't come with a manual.  I could probably go look at the spindles and try to figure it out, but the chart sticker is no longer there, so I'd be guessing at best.
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Dave_in_Rio_Rancho

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Re: Recommended RPMs for drilling balls
« Reply #6 on: June 03, 2010, 05:46:13 PM »
A strobe light is pretty handy for checking rpms.
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Doug Sterner

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Re: Recommended RPMs for drilling balls
« Reply #7 on: June 27, 2010, 04:24:44 PM »
The key to not burning up your drill bits is to use the lowest RPM that you can without the bit chattering.

I think my JET press is set somewhere in the 350 range. A slow feed rate is the most important thing when considering the quality of your drill job.
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Bluff

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Re: Recommended RPMs for drilling balls
« Reply #8 on: July 13, 2010, 12:43:18 PM »
quote:
The key to not burning up your drill bits is to use the lowest RPM that you can without the bit chattering.

I think my JET press is set somewhere in the 350 range. A slow feed rate is the most important thing when considering the quality of your drill job.
--------------------
Doug Sterner
Doug's Pro Shop
Owego, NY
http://dougsproshop@aol.com
www.dougsproshop.net
Lane 1 Buzzsaw...The Official Power Tool Of Bowling
For Real Time Interactive Bowling Conversation:
BowlingChat.net


The faster the drill turns the bit get burn faster.

If you got like a 2HP drill u can set them 300 RPM and will still cut like butter

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