Search found 194 matches

by kaleun96
Fri Mar 08, 2019 12:33 pm
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

Cool to see you got it working! They're a much cleaner limit sensor than switches in my opinion. I've got a TMC2130 on the way to try its method of limit detection (i.e. stall detection). I think I will redesign my circuitry since I can now do away with the limit switches, at least I hope so. Mike, ...
by kaleun96
Thu Mar 07, 2019 2:03 am
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

Just thought of another possible method to detect the "limits". Set the motor current to a very low value, just enough for reliable movement, then slowly run into the rail stops and record the "limit" Do you mean you would then "mark" the position of the rail at this point manually or that you woul...
by kaleun96
Wed Mar 06, 2019 1:24 am
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

Fascinating stuff! Looks like a fairly large project at this stage, particularly with several thousand lines of code. Are you implementing your own code for directly controlling the stepper motor stepping, positioning, and acceleration or is there a library that you can leverage like the AccelSteppe...
by kaleun96
Tue Mar 05, 2019 2:15 pm
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

Cheers! I would stay away from the Ti DRV types, apparently they have very poor micro-step behavior. I had been looking at the TMC2130s etc as an alternative to DRV8825/A4988 but they didn't seem as plug-and-play as the former two. But the stall detection may make it worth it if I can get rid of the...
by kaleun96
Tue Mar 05, 2019 12:31 pm
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

the mjkzz controller will automatically stop when it reaches the end of physical travel during calibration. [...] Perhaps Mike or Peter can give us more info on how this is handled? Interesting! My brief understanding after 5 minutes of Googling was that the stall detection works partly based on ba...
by kaleun96
Tue Mar 05, 2019 11:22 am
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

Thanks Rik, that's a bit surprising though. It's my impression that running a stepper motor while stalled out can damage the windings. Then again, they're fairly cheap to replace.
by kaleun96
Tue Mar 05, 2019 9:35 am
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5824

How does StackShot know when it has reached the rail limits?

I've built an automated rail of my own and use limit switches to find the min and max positions of the rail. It's a bit of a pain in the sense that it makes the cabling just that much messier. I was looking at the StackShot, through its manuals, including the communication manual, yet I can't find a...
by kaleun96
Mon Feb 18, 2019 11:33 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: My fully automated macro rig with touchscreen
Replies: 4
Views: 3593

Thanks! Besides all the neat electronic stuff, those industrial-strength magic arms caught my attention. Can you tell us where did you got them? Yeah sure they're the SmallRig branded magic arms on Amazon. In fact a lot of the camera cheese plates, the riser, rods, and rod base plate are also SmallR...
by kaleun96
Mon Feb 18, 2019 2:17 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: My fully automated macro rig with touchscreen
Replies: 4
Views: 3593

My fully automated macro rig with touchscreen

I'm relatively new here but have been lurking for the past 6 months or so. During that time I've been digesting a lot of information I've found on here to build my own macro rig. I had a manual setup for a few months last year as I started getting into extreme macro and it wasn't long before I wante...
by kaleun96
Wed Oct 24, 2018 3:41 am
Forum: Equipment Discussions
Topic: Tube Lens Test Final Results
Replies: 37
Views: 13576

Thanks for the info. So there's no way to determine effective focal length before knowing the magnification? I think that's where I was getting confused.
by kaleun96
Tue Oct 23, 2018 2:25 pm
Forum: Equipment Discussions
Topic: Tube Lens Test Final Results
Replies: 37
Views: 13576

Really appreciate all the testing you do Robert. Coming across your website a few months ago first got me on this addictive train ride that is >2x macro photography! I'm having a little trouble understanding how you calculate effective focal length in these tests. I tried searching the forum and goo...
by kaleun96
Sun Oct 21, 2018 3:20 pm
Forum: Equipment Exchange
Topic: Lens and Objective list
Replies: 10
Views: 5471

Thanks, appreciate the photos!

Tempting to pick up one of them to see if anything can be done but probably the usual case of a Nikon/Mitutoyo tech telling you it's cheaper to buy new than repair.
by kaleun96
Sun Oct 21, 2018 12:57 pm
Forum: Equipment Exchange
Topic: Lens and Objective list
Replies: 10
Views: 5471

Do you have any example photos showing the extent of the bad front elements for the Nikon and Mitutoyo?
by kaleun96
Sun Oct 21, 2018 2:42 am
Forum: Equipment Exchange
Topic: FS: Many things ;-)
Replies: 18
Views: 10016

Hi, did you end up selling the Nikon CFI 10/0.25?