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Micro stepper motors with lead screws and their thread

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NorthGuy:
Have anyone ever bought micro stepper motors from eBay which have a lead screw instead of shaft, like that:

https://www.ebay.com/itm/10PCS-DC-3V-5V-6mm-2-Phase-4-Wire-Micro-Stepper-Motor-moving-Screw-block-Nut-DIY/122247053082

There are lots of them, some said to be Cannon, other brands are present.

The thread on the lead screw doesn't look standard. M1.7-0.25 as I can infer from pictures. The nearest standard mertric threads are M1.6-0.35, M1.7-0.35 - all too coarse. Doesn't seem to be US neither - too thick for 1/16, too thin for 5/64, also too fine. But such non-standard thread seems to be very common among these motors - they all come only with this thread. What kind of thread is this? Is it ever possible to buy nuts or taps for this thread anywhere?

Neomys Sapiens:
Is the thread trapezodial or more rounded? (Look up trapezodial thread if necessary)
If more rounded, the counterpart ('nut') might be formed by an arrangement of small bearing balls.

NorthGuy:

--- Quote from: Neomys Sapiens on July 06, 2019, 04:38:09 am ---Is the thread trapezodial or more rounded? (Look up trapezodial thread if necessary)
If more rounded, the counterpart ('nut') might be formed by an arrangement of small bearing balls.

--- End quote ---

It's impossible to see the thread shape on the pictures. I don't think bearing balls can be made that small anyway - with 0.25 mm pitch, the balls would have to be 0.1 mm in diameter.

chris_leyson:
It could be a fine metric thread M1.6x0.2 or M1.8x0.2. I don't think M1.7 is standard.

techman-001:

--- Quote from: NorthGuy on July 06, 2019, 03:42:52 am ---Have anyone ever bought micro stepper motors from eBay which have a lead screw instead of shaft, like that:

https://www.ebay.com/itm/10PCS-DC-3V-5V-6mm-2-Phase-4-Wire-Micro-Stepper-Motor-moving-Screw-block-Nut-DIY/122247053082

There are lots of them, some said to be Cannon, other brands are present.

The thread on the lead screw doesn't look standard. M1.7-0.25 as I can infer from pictures. The nearest standard mertric threads are M1.6-0.35, M1.7-0.35 - all too coarse. Doesn't seem to be US neither - too thick for 1/16, too thin for 5/64, also too fine. But such non-standard thread seems to be very common among these motors - they all come only with this thread. What kind of thread is this? Is it ever possible to buy nuts or taps for this thread anywhere?

--- End quote ---

It looks to me to be a fine thread for very small precision movement inside a camera. It could well be a special thread for this type of task common in the camera industry.

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