calibrating

J

josephhkim

Rookie
I know this seems to have been discussed quite a bit but...

I did a search and a lot of the threads were broken links, probably due to the updating of the forums?

Anyhow, are fish scales reliable for calibrating?

Could someone recommend one to me?

I have a silent partner dg, so the scale has to be accurate to more than 60 lbs.

I heard of a 120 lb. fish scale? Anyone have any links to where i can buy such thing or whether they actually are accurate?

Am i better off with a regular calibrator? I heard that the increments are too large and that they are inaccurate.

Thanks for the help.
 
L

LttlElvis

Professional
My opinion is digital fish scales are for weighing fish not for calibrating your machine.

I've got one, and the digital scale is nice because of the readout in 1/10 lbs. and you can see the subtle changes as the string stretches. When I used it on the lock out crank, I used it as a secondary reference only. I still checked with the regular calibrator as my primary reference. I do recommend buying one since they are not very expensive ($12-$15).

My digital scale says it weighs up to 50 lbs., but actually goes to 75 lbs.
 
M

mellofelow

Semi-Pro
Fish or rock... weight is weight regardless what you measure. I am most certain the $20 digital scale is much more accurate than the traditional spring loaded variety.

Here's a link to some pictures of my WalMart digital fishing scale and how I use it to measure.

http://tt.tennis-warehouse.com/showthread.php?t=58248

Here's a better shot.

sensorCalibrate-1.jpg
 
J

josephhkim

Rookie
thanks for the link.

Supposedly, the 50 llb. scales are only accurate to 50 lbs. even if they go up to 75.

Unfortunately, my machine only calibrates at 60 lbs.

Are the scales accurate enough? Some people complain of inaccuracy, especially with the cheaper models.

I remember seeing a 120 lb. model being mentioned, any help there?

Also, could someone recommend an accurate spring tension calibrator? I need one with a lot of marks rather than just every 5 lbs.

Thanks.
 
Last edited:
jonolau

jonolau

Legend
That is very similar to the one I'm using on my Gamma Progression ST-II and I find it pretty accurate. It also shows the dramatic drop in tension as the string stretches after lockout and gives and idea of the tension loss of different types of strings.

I use it as my primary reference for calibration even though I also own a Gamma Tension Calibrator.
 
J

jj300

Semi-Pro
mellofelow said:
Fish or rock... weight is weight regardless what you measure. I am most certain the $20 digital scale is much more accurate than the traditional spring loaded variety.

Here's a link to some pictures of my WalMart digital fishing scale and how I use it to measure.

http://tt.tennis-warehouse.com/showthread.php?t=58248

Here's a better shot.

sensorCalibrate-1.jpg
Click to expand...


that picture shows Bob from RacquetMaxx calibrating his sensor.THe scale used is NOT a fish scale, as I was told by Bob. He actually calibrates in kg if i remember correctly
 
Last edited:
J

jj300

Semi-Pro
i deleted the e-mail that stated the product name. might be worth asking bob on his website forum. racquetmaxx.com
 
M

mellofelow

Semi-Pro
jj300 said:
that picture shows Bob from RacquetMaxx calibrating his sensor.THe scale used is NOT a fish scale, as I was told by Bob. He actually calibrates in kg if i remember correctly
Click to expand...

Even an uncertified digital scale is accurate within +/- 5 grams which equates to 0.176 ounce (or .01 pound). Therefore, measuring tension to 50 lbs should be 99.9999 % accurate.

I'm curious... in your opinion, what differences does it make?
 
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