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Z1500

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  • First and Last Name
    Kevin Tenney

About Your Machine

  • Which type of machine do you own?
    650 or 1050 Autodrive (all types)
  1. Or even better would be a feedback type motor with optical encoder, checking that the motor actually reaches top and bottom of it's stroke.
  2. I had forgot about this thread. Your old autodrives don't show this problem because they had more gear reduction, giving them much more torque to get to the top and bottom of the stroke under tension. The newer faster autodrives are geared out for speed and lack the torque to be super consistent in peak travel. The current autodrives make complete junk ammo, I took mine off my 750 and all my problems went away. It would be great if anyone at Mark7 cared and resolved this problem. I'd be delighted if the thing only ran 900RPM if they were just precision reloads.
  3. I've run a bunch of tests tonight to verify some things and I think I'm mostly right about it. So to simplify things let's just focus on the downward stroke for primer seating depth. For these tests I have completely removed the tool head and done my calibration with an empty shell plate. All testing done at Clutch setting 5. XL750 and Autodrive are new. During calibration the machine hit both top and bottom mechanical stops. So still with an empty shell plate I mount a dial indicator to measure the platform's height relative to the reloader's base. Then with the 'Primer Depth' set to 0, I hit 'Goto Bottom' and it pulls the platform all the way down and hits the mechanical stop. I zero the indicator there, that is my .000" datum. Then proceed to test many times the platforms height with 'Primer Depth' set to 0-1-2-3-4-5. It is dead on repeatable and right at .011-.012 per 'Prime Depth' # adjustment. I did this dozens of times and mixed in a bunch of full cycles of the ram and it always came back to: 0=.000 1=.008 2=.019 3=.030 4=.042 5=.054 That was fantastic but remember that is with an empty shell plate. Then I started running new pieces of Starline 9mm brass in that station and priming them. At this point we would hope for the platform to again hit those exact same heights I measured before for each 'Primer Depth' setting. Nope. 0=.030 1=.033 2=.037 3=.045 4=.048 5=.060 So the machine is NOT going an exact location each time, it seems to be affected by the strain of seating the primer. I would really hope for an error code to pop up when the machine does not reach it's targeted stroke distance. Kind of a problem for it to short stroke to different heights each time and just keep on trucking. I did some similar tests at the top of the stroke with the tool head on and found similar results. Empty shell plate goes higher than a full shell plate flaring, sizing etc. and no error given. This all leads me to believe that the motor is an open loop type stepper and has no closed loop feedback as to it's actual location. Is that right?
  4. I think I'm starting to figure out some critical information about how the autodrive works that would explain this. The autodrive does not stop it's upward or downward travel at the exact same spot every time (Terrifying). It seems to stop at a certain level of strain, not at a fixed distance of stroke. Unfortunately strain in a progressive press changes based on dozens of variables that are constantly changing. If a shell is taking a little extra effort to re-size in station one, that can cause your bullet seating depth to be high and crimp to be light in station 4+5. And what about the times when station one is empty, those bullets go in deeper and get crimped extra aggressively. Not good. But you can adjust this amount of strain with the digital clutch. If you turn it high enough I think you can make it hit the mechanical limits of the up and down stroke, just like Dillon intended. BUT at that point you are at such a high torque level, if a bullet fell off or shell was out of place it would be crushed sooo hard it would likely damage the machine. Example- I'm loading 9mm and Digital Torque of 5 is enough to get the job done but my bullet and primer seating depths vary .020" and the machine is not hitting the mechanical stops. I have only tested this a tiny bit as it scares me to run it at high torque with how fast the machine moves. But the tiny bit of testing I did at 15 torque, it did hit the mechanical stops top and bottom every time. I think the fix for this should be separate digital clutch settings for bullet seating, primer seating, and a general clutch setting that covers 95% of the stroke for safety. Oh and one extra slow speed would be great, like 100rph. Just for setting up.
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