custom grind bumpstick?
10-29-2004, 04:03 PM
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Originally Posted by Silver_Whistler
a few others? like what. just looking for some good prices.
10-29-2004, 04:48 PM
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Originally Posted by Cstraub
Custom and "good pricing" don't go together. You need to go with whoever makes you comfortable in obtaining your goals. May not be the cheapest, but aleast in your mind you made the right decision.
Chris
Chris
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10-30-2004, 11:46 AM
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Originally Posted by Cstraub
There is no beauty in a lobe that has been ground by a CNC machine.
Chris
Chris
ALL major cam manufacturers are using CNC technology.
I think Wile E. Coyote is using the Acme Cam Company. They don't use any CNC machines.
10-30-2004, 12:05 PM
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Originally Posted by Cstraub
There is no beauty in a lobe that has been ground by a CNC machine. Then their is the difference in core suppliers, is it US or offshore.
Chris
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10-30-2004, 01:24 PM
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Originally Posted by XTrooper
Really? I guess perfectly identical machining from first to last isn't a good thing in your opinion.
ALL major cam manufacturers are using CNC technology.
I think Wile E. Coyote is using the Acme Cam Company. They don't use any CNC machines.
ALL major cam manufacturers are using CNC technology.
I think Wile E. Coyote is using the Acme Cam Company. They don't use any CNC machines.
Some cam grinding equipment use a "master lobe" as a pattern to copy to the cam core. This "master lobe" is machined to be a certain "factor" times the actual lobe desired. This lowers the potential error by the "factor" of the cam master dimensions to the actual lobe's dimensions.
To over simplify, if the cam master lobe is ten times the dimensions of the actual true cam lobe, the tolerance error is 1/10 of any error found in the master. So, if the master has a .001 or 1* error in it's design or machining from it's conception, that error is now .0001 or 1/10* when it's ground into the core.
There are also CNC camshaft grinders that have the exact cam lobe design and dimensions right in their program. These machines do not use a "master lobe" or any "factor" since they grind the lobe to the size that the program dictates. The problem with this type of grinding is resolution. Whatever the resolution is of the grinder's ability is what error will be transfered into the actual cam lobe.
I have sold camshafts done on both types of machines and for most engines there's little to no problem with either. When you get into some exotic race only designs, with major rocker ratios, the better the machining results in a better cam.
As for "imported" cam cores, well without getting some sponsors in an uproar, if the camshaft is cheaper than most, I'm pretty damned sure it's an imported core and ground out of the USA. Not to hard to spot if you know what to look for...
"The bitterness of poor quality remain long after the sweetness of a low price is forgotten"
Ed
10-30-2004, 03:31 PM
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Originally Posted by EDC
Clarification is needed here...
Some cam grinding equipment use a "master lobe" as a pattern to copy to the cam core. This "master lobe" is machined to be a certain "factor" times the actual lobe desired. This lowers the potential error by the "factor" of the cam master dimensions to the actual lobe's dimensions.
To over simplify, if the cam master lobe is ten times the dimensions of the actual true cam lobe, the tolerance error is 1/10 of any error found in the master. So, if the master has a .001 or 1* error in it's design or machining from it's conception, that error is now .0001 or 1/10* when it's ground into the core.
There are also CNC camshaft grinders that have the exact cam lobe design and dimensions right in their program. These machines do not use a "master lobe" or any "factor" since they grind the lobe to the size that the program dictates. The problem with this type of grinding is resolution. Whatever the resolution is of the grinder's ability is what error will be transfered into the actual cam lobe.
I have sold camshafts done on both types of machines and for most engines there's little to no problem with either. When you get into some exotic race only designs, with major rocker ratios, the better the machining results in a better cam.
As for "imported" cam cores, well without getting some sponsors in an uproar, if the camshaft is cheaper than most, I'm pretty damned sure it's an imported core and ground out of the USA. Not to hard to spot if you know what to look for...
"The bitterness of poor quality remain long after the sweetness of a low price is forgotten"
Ed
Some cam grinding equipment use a "master lobe" as a pattern to copy to the cam core. This "master lobe" is machined to be a certain "factor" times the actual lobe desired. This lowers the potential error by the "factor" of the cam master dimensions to the actual lobe's dimensions.
To over simplify, if the cam master lobe is ten times the dimensions of the actual true cam lobe, the tolerance error is 1/10 of any error found in the master. So, if the master has a .001 or 1* error in it's design or machining from it's conception, that error is now .0001 or 1/10* when it's ground into the core.
There are also CNC camshaft grinders that have the exact cam lobe design and dimensions right in their program. These machines do not use a "master lobe" or any "factor" since they grind the lobe to the size that the program dictates. The problem with this type of grinding is resolution. Whatever the resolution is of the grinder's ability is what error will be transfered into the actual cam lobe.
I have sold camshafts done on both types of machines and for most engines there's little to no problem with either. When you get into some exotic race only designs, with major rocker ratios, the better the machining results in a better cam.
As for "imported" cam cores, well without getting some sponsors in an uproar, if the camshaft is cheaper than most, I'm pretty damned sure it's an imported core and ground out of the USA. Not to hard to spot if you know what to look for...
"The bitterness of poor quality remain long after the sweetness of a low price is forgotten"
Ed
10-31-2004, 11:55 AM
#15
I would venture to estimate that 80% of all cams produced in the US are still ground on automatics that date from the '40's. This includes rollers. These automatics chug away and are very cost effective since they have been paid for for 40 years. It is not ood business to run shelf stock cams on CNC equipment, your accountant would scream at you at the end of the year.
Chris
Chris
