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Old 10-26-2010, 07:47 PM
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Chevy bolt pattern machining

Hi guys, Can anyone tell me how to figure a 4 3/4 bolt pattern when drilling different hubs? A friend of mine wants to change an early Chevy six bolt to a 4 3/4 five bolt. How does the machine shop set up on this? Thanks in advance, Rod

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Old 10-26-2010, 07:59 PM
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Machine Shop uses an Indexing Head. This can be done on a Milling machine or Lathe.

Check some of these Google links for How to & making your own Index plates etc.. May even find a YouTube Vid
http://www.google.com/#hl=en&expIds=...510c6acf0fe428

How To Measure Wheel Patterns
http://members.cox.net/completevalue...l#HOWTOMEASURE
http://members.cox.net/completevalue/wheelpat.html
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Old 11-12-2010, 08:46 PM
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Thanks

Hey SSedan64, thanks for the info. I hadn't been on here in awhile. I'll check out those websites. Thanks again, Rod
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Old 11-12-2010, 09:31 PM
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I've never understood how the 5 lug measurement can be exactly accurate. Not that I'm arguing that it is wrong. I can see the even lug patterns, but it seems to me that the actual measurement on the 5 lug pattern would somewhat depend on the size of the bolts. If you had ridiculously large bolts, say 1", would that not change the measurement, the way we do it? What am I missing?
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Old 11-13-2010, 05:23 AM
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The center location of a stud in a 4 3/4" bolt pattern is still the same. No matter what the stud diameter is..
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Old 11-13-2010, 06:31 AM
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bolt circle measurement

The second link does not give you and accurate measurement, just close enough the check at the wrecking yard or swap meet. When programing the CNC you use the actual circle dimension , A 5 on 4 3/4 you use the actual 4.75 in, diameter dimension then divide the circumfence into 5 equal segments.
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Old 11-13-2010, 09:01 AM
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Quote:
Originally Posted by timothale
then divide the circumfence into 5 equal segments.
Just to make it perfectly clear:

360 degrees divided by 5 equal 72 degrees. After drilling the first hole on the 4.750" circle, you rotate the axle flange 72 degrees and drill the next hole. Three more times and you have all 5 holes evenly spaced.
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Old 11-13-2010, 01:22 PM
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So I'm not wrong then. That method to check bolt pattern on a 5 lug is an approximation. Thank you.
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Old 11-13-2010, 01:24 PM
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Quote:
Originally Posted by crownver
So I'm not wrong then. That method to check bolt pattern on a 5 lug is an approximation. Thank you.
Actually, you are very correct as far as the popular "approximation" measurement goes. The diameter of the studs will change the measurement, which is why this is only an approximation. A lot of people don't understand this.
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Old 11-14-2010, 07:48 PM
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Thanks

Hey guys, Thanks for all the neat posts and conversation. That gets me down the road. Thanks again, Rod
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