Another indirect laser filament sensor
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Well here's how it's looking, parts ordered so lets hope it's going to work
It's going to use:
3x MR85RS bearings
1x MK8 drive gear
2x 16mm steel dowel pins
2x PTFE connectors
2x M3 x 6mm bolts
4x M3 x 14mm boltsOverall dimentions (without Molex and PTFE connectors) is 26.6 x 24.1 x 25.7mm (HxWxD)
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Just did the final touches with spliting the top housing, printing the three parts atm!
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@Exerqtor it will be intresting to see what you find: if the laser will work at all with the hobbed teeth. I think its not going to be as good as reading a smooth surface, Maybe the idler would be better?
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@T3P3Tony
Yeah thats what i feared. Don't know how wide the read area is on the sensor? But it's about 2mm of flat area before the hobbs start directly under the sensor, so i hope that will work.The reason i want it to read off the hobbed gear is to ensure that it's not slipping on the filament, that seemed to be the biggest issue on Bruno's design.
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@Exerqtor can you look at the side of the hobb ?
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@T3P3Tony
How you mean? -
either on the edge where the hobbed teeth are not cut in, or at 90 degrees, looking at the side of the hobb (this would require some sort of window so the laser only "saw" part of the rotating wheel)
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@T3P3Tony
Well yeah if i completely redesign the bugger i can look at the axle if that would be even better? I have no idea what would be the perfect conditions for the laser to read, that's kinda why i made this thread lmao.
Or what the focal point is etc. -
@Exerqtor you want to look at a smooth surface but ofc that needs to be moving so the center of the axle is no good - needs to be close to the edge.
The datasheet for the sensor chip we are using is here for more info:
https://www.pixart.com/_getfs.php?tb=product&id=70&fs=ck2_fs_en -
@T3P3Tony
Haha no the axle center wouldn't do anyone much good
But with the distance from chip top to tracking surface being between 5 ~ 60 mm on glossy metal
surfacesIi think I could make it work with the space between the hobbing and z-screw. At least with some trial and error when it comes to the "view window" on the sensor housing.Since they don't mention any given area needed for the tracking to work i guess it's more up to the working conditons and enviroment the sensor is used.
Need to get the sensor first, your only shipping the 2.0 now btw?
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@Exerqtor yep - the one with the PAT9130
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@T3P3Tony
Goodie , let's hope the trip over to Norway goes fast.