fluffy
Beat up Radials
Posts: 8
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Post by fluffy on Mar 10, 2012 0:34:28 GMT -5
Does moi matching of clubs create similar "roll" feel for clubs? What i mean is, is the mass of the clubhead and its distance from the axis of the club shaft used in any MOI calculation? I've never liked how the various irons in my bag feel like they require different effort to square the face.
Some folks may argue that this isn't a matching issue but perhaps is related to the varying grip thickness on different irons. To this I inquire, is there a tool or technique for matching grip thickness across an iron set?
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Post by Richie3Jack on Mar 10, 2012 9:08:40 GMT -5
Welcome aboard, fluffy.
That part is a little above my knowledge of science, but the MOI-weight matching has to do with the axis of rotation of the club.
One of the differences between swingweight and MOI-weight is that if I backweight a club, the swingweight will get 'lighter.' MOI weight will not get lighter, but it won't get as heavy as if I added that weight to the clubhead. And from what I gather it has to do with the weight up near the butt-end of the club being further from the axis of rotation.
So, let's say I have 10-grams of weight. If I add it to the butt end of the club, it may not affect the MOI-weight by more than 10 kg/cm^2.
But, put that 10-grams of weight on the clubhead, it will probably affect the MOI-weight by 80 to 120 kg/cm^2 (depends on the club, usually longer clubs are more affected by weight).
So the grip thickness...probably not an issue with MOI-weight.
However, if you feel that some irons just don't feel right, I'd just about guarantee that MOI-weight is off.
3JACK
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fluffy
Beat up Radials
Posts: 8
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Post by fluffy on Mar 10, 2012 19:10:22 GMT -5
I may be wrong in what i'm about to say, if so i'd love to be corrected. I believe all MOI's are defined from some point of rotation, so MOI fitting of clubs is about the butt end of the club. This should then provide similar feels for the motion of the uncocking of the wrists (#2 accummulator release for tgm folks and perhaps even accum #1 & #4). I must interject that this type of fitting is very appealing to me and i'm exciting to try it someday (not in the budget for now). But i'm curious if anyone has tried additionally MOI matching the weight of the club head about the axis of the shaft. This would, in theory, make the roll feel of the clubs the same (#3 accumulator release).
It may be that Moi matching about both rotation points isnt possible and that if a fitter must choose, matching about the butt of the club is of more consequence.
Just curious.
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fluffy
Beat up Radials
Posts: 8
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Post by fluffy on Mar 10, 2012 19:14:26 GMT -5
Btw, does anyone have tips for making all the grips on the irons the same thickness?
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Post by pavaveda on Mar 10, 2012 20:30:50 GMT -5
I know from looking at a patent of an MOI machine that they had an adjustable fulcrum point; one at the butt of the club, and one about 4" down the shaft. I'm not sure which one the Auditor machine uses though.
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Post by Richie3Jack on Mar 10, 2012 20:36:59 GMT -5
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fluffy
Beat up Radials
Posts: 8
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Post by fluffy on Mar 10, 2012 22:25:22 GMT -5
Thanks for the link to the manual. It did clarify some issues. Because of the orientation of the club when it is measured, the MOI value measured does seem to include "roll feel". Now i'm even more eager. Sigh.
Great forum & blog btw.
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Post by Richie3Jack on Mar 11, 2012 8:32:08 GMT -5
Thanks.
When I fit for MOI-weight, I look at impact dispersion first. With the irons, that's pretty much all you need because I usually test with a 6-iron and outside of one potential customer (who had some swing issues) everybody I've fit so far for MOI-weight has been able to get their impact dispersion very small.
I had one customer tell me something I thought was accurate. He said 'I can't imagine having precise impact with a sledgehammer or a matchstick.' That's what happens when the MOI-weight is too light or too heavy.
People also don't understand how such a small difference can affect the results. I can see a difference in impact dispersion for customers in just 20 kg/cm^2 differences. And I could personally feel a difference in my driver that was originally made 10 kg/cm^2 lighter. I then added a 1/2-gram strip to the hosel to get it to 10 kg/cm^2 and it felt much better.
3JACK
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