Hello,
The screw that cause the “Gripper” found in the Ultimate 2.0 kit is stripped so the motor spins, but the Gripper does not open or close. Can I buy the screw, the Gripper motor, or the entire Gripper assembly?
I found a link for replacement motors, but that link does not work.
Thanks!
Hi @GeorgeH
I find it hard to believe that you have totally stripped the thread on this little motor. This thread is M4 x 0.7 and in the UK you can buy a cheap die from Amazon for about £3 to clean/ recut the thread & you could probably do this without the need for a die-stock (holder):
The Ultimate’s powerful and very reliable motor (with the screw-threaded shaft) that powers the Gripper unit is a variant of Makeblock’s rather fine series of N20 Mini Motors - it has a gear ratio of 1:25 and a running speed of 100 RPM . You may be able to source one of these on-line and thread the shaft yourself?
Another quick trawl of Amazon found that many of these are commonly available - inc. this long-shaft one:
For info.: Makeblock’s original on-line spec suggested that the Ultimate’s gripper motor would automatically stop running when the gripper was fully open or closed and not burn out. The threaded section of the motor shaft is a standard right-handed thread and if the gripper is part-closed then you should note that there is a plain unthreaded section of the screwed shaft (which allows the motor to slip when the Gripper is fully open) - you could file this down yourself using a needle-file when / if modifying the shaft shown above. N.B. Jaws fully open is fine, and whilst clockwise power is applied to it, the motor rotates and the the bit of the Gripper that the screw passes through just slips in the non-threaded (filed-down) section. When the motor’s direction is reversed then the thread pulls the Gripper jaws closed again - but beware, at fully closed, there is NO such slippage arrangement and if overzealously closed then the Gripper tends to jam with the jaws shut fast!
But I have never known it strip the thread.
If you search diligently for ‘Makeblock 86502 Robot Gripper’, you can still find these - see:
Hope this helps.
@CommandeR pretty sure this is no longer produced 
… I guess it must still be in stock on some old sites.
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