Alan, Thanks!!! I knew I had asked in the right place. After reading all this I'm beginning to wonder if the triple beam balance is the way to go?
On a side note, I've got an old, and at the time best, GS beam SW scale. It reads 0 when the pointer is at 0g, but the swingweights don't match Wishon's MOI values, they are about 1 point off and varies by length of club. I'd be willing to guess Wishon's numbers are spot on. (The scale is level front/back and side-to-side, so that isn't the problem).
/Ed
Alan Brooks wrote:
Be careful. Resolution (or 'Readability') and accuracy are not the same thing. Resolution is simply the least significant digit in the readout. Accuracy is how close to 200-g does it read when you put a 200-g weight on it. There can be a huge difference. If you are buying it in person, take your 200 (or 205) gram weight with you and try them out until you find one that reads very close to 200-g. Repeatability is another issue. Place your weight on the scale and read the weight, take it off, put it back on and see how close it comes to repeating. Do this a number of times. Temperature compensation is another potential problem. Auto-zeroing helps because it takes out an output shift due to temperature, but you can still have sensitivity errors, i.e. your 200-g weight will weigh a different amount on a cold day and a warm day. Check the specifications. Many of these scales are made for kitchen use and it is assumed that they will be in a nearly constant temperature environment.
In any case, after you get the scale, check it regularly with a known weight, and again when it is warm and cool. Even if the repeatability is not what you had hoped you can easily develop correction factors.
Good luck,
Alan Brooks
At 12:50 PM 5/28/2004 -0700, you wrote:
I've been interested in getting a new scale and this one looks pretty neat. I'm sure there are some scale experts on the forum. (I looked at some triple beam scales, but this looks like it serves my needs).
500g capability, which is all I need
1/10 gram "readability" which evidentially means accuracy according to a few web sites I've seen. I've started playing with Wishon's MOI matching stuff and 1/10 gram resolution is suggested.
Has a calibration weight, which is huge for me.
Tare (zeroing feature)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=34088&item=2694364408
Thx,
/Ed
