Good day. I was planning to make a shrinkable tube cutter using the project like on the youtube above. Is it possible to make the measurement into 0.01mm or 0.1mm, we will use this on business and will need high precision of measurements. The target shrinkable tube to be cut is 50.25+/- 0.025.
Thank you all. I hope you can help me.
Any suggestions would be highly appreciated.
The one I built is not like the one you linked. I have found it to be very accurate and consistent.
I have only measured with a tape measure but it is always right on the mark. So far I have run ~8k ft. of wire thru it.
Here is a terrible video of mine: Wire cutter and stripper - YouTube
One thing to watch out for is that different diameter wires will have a different number of steps per inch.
Most shrink tube I've seen is normally flattened which I would imagine would mess with the ability to feed thru especially when using an extruder as shown in your link.
I am planning to fabricate a customize extruder so that the shrinkable tube will run smoothly.
I reckon there are two changes you need to the project in the video - one definite and one possible.
The definite change is to allow the user to enter measurements in the precision you require. I suspect a proper keypad would make that much easier.
The possible change is to the feed mechanism. In the video the feed is driven directly by the stepper motor so the smallest movement will be determined by the size of the cogged wheel and the size of a motor step. With microstepping you may get sufficiently small movements - but you will need to do some experiments to verify that. Otherwise you would need some form of reduction gearing (without backlash) between the motor and the drive wheel.
The cheap 3D printers get the sort of precision you want using microstepping.
...R
I think the OP meant "accuracy", not "precision", which only refers to repeatability, not being
correct 
MarkT:
I think the OP meant "accuracy", not "precision", which only refers to repeatability, not being
correct
You may be right. if so I would expect the model in the video to be sufficient. Stepper motors are good at repeatability.
I had assumed the OP wanted to measure in increments of less than 1 mm
...R
What I really mean is accurate and precise. haha.
I need to get that cut ranging from 50 to 51mm. And it will run for almost 8 hours non stop.
If I would use 1.8degree Stepper motor what do you think the accuracy of its cut will be, using the tools indicated in the video.
Robin2:
I reckon there are two changes you need to the project in the video - one definite and one possible.The definite change is to allow the user to enter measurements in the precision you require. I suspect a proper keypad would make that much easier.
The possible change is to the feed mechanism. In the video the feed is driven directly by the stepper motor so the smallest movement will be determined by the size of the cogged wheel and the size of a motor step. With microstepping you may get sufficiently small movements - but you will need to do some experiments to verify that. Otherwise you would need some form of reduction gearing (without backlash) between the motor and the drive wheel.
The cheap 3D printers get the sort of precision you want using microstepping.
...R
I would only need 2 different types of cut. 50-51 and 27-28.
I will look into microstepping. Thank you!
tralalas:
I need to get that cut ranging from 50 to 51mm.
I presume you mean 50.5mm +/- 0.5mm
If I would use 1.8degree Stepper motor what do you think the accuracy of its cut will be, using the tools indicated in the video.
The stepper will be fine (possibly with microstepping). Its the equipment attached to it that you need to experiment with. For example there may be slippage between your material and the rotating wheels. That sort of thing won't be in any datasheet.
...R
Moving insulating plastic material generates static charge. Be sure to take care of it.
Paul
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