Swingweight scale calibration

[GarthM]

Does anyone know if there is a way to calibrate a swingweight scale? The one I have is giving me a 2-4pt difference between what the scale reads and what the numbers of the head/shaft/grip weights/lengths indicate the SW should be.

I have the Maltby scale (can't post link to it from work for some reason), but it's the black one. Should this scale "balance' at some point without a club on it and without the counterbalance in place?

As an example I have a 38" 5-iron, total weight 430g with a balance point of just over 28" from the butt end. According to Dave Tutelman's numbers, this should give me about a D-0 (but less than a D-1). My scale is reading D-4.

Just curious.

Garth

[1972Apex]

My guess is that the scale is bang on and Dave's numbers are off.
The scale should balance out with the weight set to 0 as if you were weighing components not swingweight. If it is reasonably close you are out at the most 1 swingweight point.
My experience with that scale is they are always accurate to within 1/2 to 1 swingweight point.

[GarthM]

Thanks, I'll try that and see what happens. At least I got it within 2-4 pts, it was out about 6 -- work bench is not 100% level!!!

[BC MIST]

Thanks, I'll try that and see what happens. At least I got it within 2-4 pts, it was out about 6 -- work bench is not 100% level!!!

FWIW:

Swingweight = {[Head weight*(Length -14) + Cut Shaft Weight*(Shaft Balance Point – 13.8) – 10 * Grip Weight)]*.03528 -143.5} / 1.75

An answer of 42.6 means that the SW is D2.6 or D3. A tens digit of 4 means "D," of 3 means "C" of 5 means "E."

The SW scale may lie, but the mathematics does not.

[danscustom]

FWIW:

Swingweight = {[Head weight*(Length -14) + Cut Shaft Weight*(Shaft Balance Point – 13.8) – 10 * Grip Weight)]*.03528 -143.5} / 1.75

An answer of 42.6 means that the SW is D2.6 or D3. A tens digit of 4 means "D," of 3 means "C" of 5 means "E."

The SW scale may lie, but the mathematics does not.

Cool, math and golf really do have a lot in common.
I love math, um, I mean golf

[jvincent]

Garth, do you know if your scale was accurate to begin with?

[Chieflongtee]

I have a GW scale. All one has to do to calibrate it is to slide the weight all the way to 0. If the other end balances then it is calibrated. If not the legs will have to be adjusted and levelled to whatever surface it is sitting on.

[GarthM]

Garth, do you know if your scale was accurate to begin with?

I can only assume that it was. It does balance out with the weight at zero. I think it may have had more to do with an unlevel surface. I am still fighting with the mathmatics that BC has sent over so I've got other issues to deal with!!

Thanks for all the help guys.

[1972Apex]

The math is never wrong unless it is done incorrectly. Mess up one calculation or measurement and it will be way off.
I have no doubt that BC Mist has the skills to accurately calculate everything perfectly every time. I don't. Judging from your results, I'm not sure you do either LOL! (No offense intended...).
If you're balancing out at 0, I am pretty sure the scale is at least close. I have never seen one of those scales out that much. It has to be the math...

[Chieflongtee]

I can only assume that it was. It does balance out with the weight at zero. I think it may have had more to do with an unlevel surface. I am still fighting with the I talk of tipping lots on a weak shaft to bring it to a 5.0
I talk of tippin less on a stiff shaft to bring it to a 5.0
Same stiffness - different bent point.so I've got other issues to deal with!!

Thanks for all the help guys.

Too complicated. Go to myostrich and download either the Chicago sw or the excel spread sheet(give it time you impatient- it takes about a minute to download). Someone has done all the maths for you

Swingweight Calculator (Excel Spreadsheet)
Chicago Golf Swingweight Calculator (Windoze Program)

[jvincent]

I can only assume that it was. It does balance out with the weight at zero. I think it may have had more to do with an unlevel surface. I am still fighting with the mathmatics that BC has sent over so I've got other issues to deal with!!

The scale I was referring to was the scale you used to measure the heads/shafts.

I use an electronic scale with 1g resolution that works pretty well.

[GarthM]

My digital scale for weighing things is good to .5g and it is accurate. I may be a bit off in the measurements for length (/16ths are ok, /32nds not so much).

The scale I was referring to was the scale you used to measure the heads/shafts.

I use an electronic scale with 1g resolution that works pretty well.

[GarthM]

[QUOTE=1972Apex;218313]The math is never wrong unless it is done incorrectly. Mess up one calculation or measurement and it will be way off.
I have no doubt that BC Mist has the skills to accurately calculate everything perfectly every time. I don't. Judging from your results, I'm not sure you do either LOL! (No offense intended...)
QUOTE]

you and me both brother!!!!

Having made some more accurate measurements the number are getting closer to reality (I think).

[Kona Golf]

I have a calibration shaft that was sent to me by the PCS as part of the eqaulizer software. Mine is dead on!