Overshoot of RTZ on MS-16

[Victory Pete]

I have been making tape tension adjustments on my MS-16 and since I have started tweaking it misses Zero. I have the tensions set to factory specs with a Tentelometer. If I increase the FF and RW tensions a bit it seems to improve. I understand the whole concept of dynamic servo braking, the servo motor behind the leading servo motor must have less torque so it will put tension on the tape and provide the braking resistance. I finally realized the actual mechanical brakes have nothing to do with slowing down the tape. They are for keeping tension on the tape and tension arms when the tape is stopped, like a parking brake.
VP

[dodgeaspen]

Hey Pete, I was reading your post and was curious on the ms-16 is it supposed to stop directly on 0? My 38 will RR and FF until it gets close to 0 it may stop a few feet before. I was just wondering. BTW, how are the studio walls coming?

[Victory Pete]

Originally Posted by dodgeaspen

Hey Pete, I was reading your post and was curious on the ms-16 is it supposed to stop directly on 0? My 38 will RR and FF until it gets close to 0 it may stop a few feet before. I was just wondering. BTW, how are the studio walls coming?

Yes they are suppose to slow down then stop right on zero after you hit RTZ. The RW and FF tension is not set right. It is a very sensitive adjustment. I managed to fix one of my TSR-8's before that would overshoot rewinding to zero, I tweaked the RW tension pot and after a few tweaks it stopped perfectly everytime. I should be able to work on your Test Tape Clone soon. The studio is not finished yet but it is squirrel proof!
VP

[dodgeaspen]

Hey man no hurry. I'm just glade you have no more unwanted 4 legged guests in the studio.

[sweetbeats]

Dunno if this relates but I had an issue on my 58 where the brakes were not adjusted to hold strong enough and on a FF wind the takeup reel would coast a bit too far allowing enough slack for the tension arm to come to its unloaded stop and the transport would go into stop mode. The brakes certainly play a role.

Are you sure your Tentelometer is correctly calibrated, and describe how you are doing it...I had some real headaches doing the tensions on my 58 and I never got them right before I cooked some of it but I learned a bunch of particulars on calibrating the Tentelometers particularly from Beck at the time.

[Victory Pete]

Originally Posted by sweetbeats

Dunno if this relates but I had an issue on my 58 where the brakes were not adjusted to hold strong enough and on a FF wind the takeup reel would coast a bit too far allowing enough slack for the tension arm to come to its unloaded stop and the transport would go into stop mode. The brakes certainly play a role.

Are you sure your Tentelometer is correctly calibrated, and describe how you are doing it...I had some real headaches doing the tensions on my 58 and I never got them right before I cooked some of it but I learned a bunch of particulars on calibrating the Tentelometers particularly from Beck at the time.

I dont know about the 58 but on the MS-16 and others the mechanical brake bands around the reel hubs have nothing to do with the actual slowing down of the tape in FF or RW. The tension in FF and RW is maintained by the difference in torque between the 2 servo reel motors. The Tentelometer is a brand new T2 H20 ML from Tentel, the calibration kit is backordered but I imagine it must be accurate for now.
VP