question for optronics 4T users

[Uncle Fester]

Our lab says if we calibrate weekly our 4T ALL lenses will come out sized exact. My experience is that MOST lenses are spot on. Occasionally they are slightly (1/2mm or less) big and need to be touched up by hand even when the 4T has been recently calibrated. Thanks in advance for your feedback:cheers:

[JerryR]

I have always calibrated daily, every morning. Comming from the old school I'm always amazed at how spot on the lenses come out.

[fjpod]

Honestly, we almost never calibrate our 4T. We calibrated it once when we set it up. We are running a 7E edger. We only size calibrate the edger after every blade change. No problems.

[Judy Canty]

I did the same thing...calibrated every day.

[OpticLabRat]

The 4T tracer is probably the best tracer ever designed.:cool:

[jofelk]

I only calibrate if we find a problem. We have been using the 4T for 5 years. I may have calibrated a couple of times, for axis. The sizing has been incredibly
consistent. There is a sizing difference between very small and very large frames that you need to accomodate for. This is found in the tracer settings.

[Johns]

We just got ours at the beginning of the mohth, and it's right on the money everytime.

[Uncle Fester]

Thanks for the feedback! I'm still curious if labs need to tweek their setting on the edger. We transfer over the internet our tracing. I would say maybe 1 job in 20 comes in to me needing a touch up on the handstone. It seems to me if my calibration was off the percentage would be higher. No :confused:

[PNKansas]

If you were able to find a good "robust" frame front that could stay consistently the same shape over and over it would be a great thing to have your tracer and edger calibrated to.
I would suggest that you get a "Cambridge" frame front (54/20). Trace it on your 4T tracer you should come up with a C-Size of 159.7. (+/- 0.1)Then if you take that circumference and go to your paternless edger and punch in the same job that you traced your cambridge frame front in it should fit the first time around ("one cut"). If it doesn't pan out the first time around then you have a sizing difference between your tracer and your edger which needs to be rectified.
We calibrate our 4T and 6ES daily to the same frame everyday and keep a running log of our c-size differences if any. This has enabled us to sell our accuracy with lens only jobs to our accounts by over 30%. It is marvelous.
As a side note I would suggest that you also purchase a "digi-sizer" from Precision Tool Technologies to go along with calibrating your c-sizes at your edger too....ask for Wayne. I'm sure that he'll help you out.