JJRobots COMMUNITY
My experience with the slider - Printable Version

+- JJRobots COMMUNITY (http://forums.jjrobots.com)
+-- Forum: JJrobots (/forumdisplay.php?fid=1)
+--- Forum: Motorized Camera SLIDER (/forumdisplay.php?fid=47)
+--- Thread: My experience with the slider (/showthread.php?tid=2539)

Pages: 1 2 3


My experience with the slider - MisterMaker - 05-28-2020 07:32 PM

Since I cannot upload pictures of more than 500kb
See my pictures on my twitter:
https://twitter.com/MvdH74169613/status/1266085914721357824
Things I did.
Used a standard cnc shield controller box with a silent fan which I had laying around, can download the box here: https://www.thingiverse.com/thing:1765459
Added a holder for this box and fixed both the battery pack and the control box with Velcro.
I designed my own tripod mounts, one goes directly in the clip, the other is screwed on a cheap ball joint.
This is a monopod that I already had, you can also use a cheap light fixture. But I use the ball joint to be able to put the camera on an angle.
My camera is fixed with my own designed tripod mount. It is currently only fixed with friction
Some testing results they all where not on the current setup:
https://twitter.com/MvdH74169613/status/1265753346608168965
https://twitter.com/MvdH74169613/status/1265349775190298626
I'll update this thread.
Yesterday I noticed some vibrations in the footage, so today I did some more testing and saw that if the slider is under an angle not all wheels are rotating.
I had this issue in putting tension on the wheels, I had or to much or not enough tension. So I was almost breaking the 3D printed part, or I had to much wobble.
I probably going to try 3D printed v-wheels that have some kind of spring effect.


RE: My experience with the slider - MisterMaker - 05-30-2020 03:18 PM

I am currently redesigning the mounting part to be more strong, I had the issue that the V-wheels mounts broke off when I made the wheels to big.
And they where lose when the wheels where to small.
Depending on how this lockdown is taking, I might redesign it completely.

[attachment=500]
[attachment=501]


RE: My experience with the slider - MisterMaker - 05-30-2020 10:06 PM

So I printed my new mounting plate. And it worked out perfectly.
I could adjust the tension on the v-wheels from too loose to too tight.
Now I had some Vibrations from friction, but I am going to let it run for a while and see how it goes then.
Maybe I shouldn't have used 3D printed V-wheels.
[attachment=502]


RE: My experience with the slider - JJrobots JP - 05-31-2020 04:30 PM

(05-30-2020 10:06 PM)MisterMaker Wrote:  So I printed my new mounting plate. And it worked out perfectly.
I could adjust the tension on the v-wheels from too loose to too tight.
Now I had some Vibrations from friction, but I am going to let it run for a while and see how it goes then.
Maybe I shouldn't have used 3D printed V-wheels.

This is a brilliant idea. Could you upload the stl model of the carriage, so I can test it?
The precision when 3D printing is always a problem as it depends on the filament, temperature even nozzle diameter. So a method to get rid of those "inaccuracies" is always welcome.


RE: My experience with the slider - MisterMaker - 05-31-2020 08:14 PM

While my slider is running in the background I was checking the math...
Since I am using stuff I had at home.
I am using drv8825 that runs on 1/32.
And I am using a 16 teeth pully.
So for the code:
This depends on the pulley teeth and microstepping. For 20 teeth GT2 and 1/16 => 80 200*16 = 3200/(20*2mm) = 80
200 *32 = 6400/(16*2mm) = 200
Now It looks like my rail length is correct, but the speed isn't and the x dimension is at least twice to short.
So it is a bit strange that the rail lenght is correct but the X dimension isn't. Is there another setting? (I am also using the old apk since I have old andriod.)

Further testing made me realize that there is an issue with the rotating head, there is some slack caused by the gears. If you have the slider perfectly straight it won't affect anything. But in an angle the camera will have some play on the gears that results in vibration in the footage.

Best solution would probably be to replace the gears with a gt2 belt as a belt doesn't have any slack, issue is I don't have a round gt2 beld that fits. Can maybe make one since I have enough straight gt2 belts.


RE: My experience with the slider - MisterMaker - 05-31-2020 10:24 PM

I added a belt and it fits in nicely only had to split up the top part to make it able to place the belt.
I hope it doesn't need any belt tightening since it is a low load, but even that should be possible by making the mounting holes of the nema motor into slots. Belt is 176mm I found one seller who got them https://nl.aliexpress.com/item/32649996221.html?spm=a2g0o.productlist.0.0.96292785ZpQrLE&algo_pvid=af4394e0-92ba-4ffb-84ec-9f46210acef2&algo_expid=af4394e0-92ba-4ffb-84ec-9f46210acef2-10&btsid=0ab6f81e15909637401086142e6822&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
For JJ it would probably be smart to use the 20 tooth pulley, I am using the 16 version since I have that one here.

[attachment=505][attachment=506]


RE: My experience with the slider - MisterMaker - 06-01-2020 09:32 AM

(05-31-2020 04:30 PM)JJrobots JP Wrote:  
(05-30-2020 10:06 PM)MisterMaker Wrote:  So I printed my new mounting plate. And it worked out perfectly.
I could adjust the tension on the v-wheels from too loose to too tight.
Now I had some Vibrations from friction, but I am going to let it run for a while and see how it goes then.
Maybe I shouldn't have used 3D printed V-wheels.

This is a brilliant idea. Could you upload the stl model of the carriage, so I can test it?
The precision when 3D printing is always a problem as it depends on the filament, temperature even nozzle diameter. So a method to get rid of those "inaccuracies" is always welcome.
I have added the stl, but be aware I have done some last minute adjustment based on my last test. I noticed the parts was sliding over the top of the profile. So I added a bit more space above the profile.
I tested the 3D model and it didn't work...
[attachment=507]


RE: My experience with the slider - MisterMaker - 06-01-2020 03:12 PM

Quick update: found a easy way to make a closed loop gt2 belt. https://twitter.com/MvdH74169613/status/1267462879051161601
Some recording from yesterday before I added the belt. https://twitter.com/MvdH74169613/status/1267192728921739264


RE: My experience with the slider - MisterMaker - 06-02-2020 11:03 AM

Another update:
https://twitter.com/MvdH74169613/status/1267523494755078145
Slider now runs very smooth no weird jerks caused by the gear.
Only some vibrations at certain speed, these are obviously caused by friction, since the top part hangs on the aluminum profile.
I fixed this in above STL, so if someone print this I wonder how it works. I tried grinding out a layer or 2, put that was not enough.
I have to reprint that part. Just waiting till I got the top part finished because I probably want to modify more on that part.


RE: My experience with the slider - JohnQ - 06-03-2020 09:15 AM

(06-02-2020 11:03 AM)MisterMaker Wrote:  Another update:
https://twitter.com/MvdH74169613/status/1267523494755078145
Slider now runs very smooth no weird jerks caused by the gear.
Only some vibrations at certain speed, these are obviously caused by friction, since the top part hangs on the aluminum profile.
I fixed this in above STL, so if someone print this I wonder how it works. I tried grinding out a layer or 2, put that was not enough.
I have to reprint that part. Just waiting till I got the top part finished because I probably want to modify more on that part.
Printing your MODs! Impressive job. I have the same slider and mine goes butter smooth, but I have to say that I am using my iphone as camera. It looks like for a camera like yours, it is not the same, I have a Nikon D3500 I am going to try with your improvements. Please keep us udpated!