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hpi_guy
Junior Member
United Kingdom
401 Posts |
 Posted - 12 January 2012 : 20:07:35
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| Does anyone have a tool for removing a stripped hex screw? |
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TomTom
Average Member
Kyrgyzstan
596 Posts |
Posted - 12 January 2012 : 20:15:37
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if you can cut a slot into the head and use a flat screwdriver. Only way really if its a small screw like most on a RC car???
If your lucky you might be able to grip it with some pliers and turn it that way.
When tightening / loosening hex headed bolts always clean out the head first so the driver fits all the way into the hole and also use good quality drivers. I bought some cheap hex drivers for my losi and thought they were stripping the heads until I noticed it was actually the driver head stripping! Bought a set of EDS ones and havent looked back  |
Edited by - TomTom on 12 January 2012 20:20:28 |
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hpi_guy
Junior Member
United Kingdom
401 Posts |
Posted - 12 January 2012 : 20:34:01
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| I use a set of ansmann ones, its the grub screw on the pinion but I can't get the pinion off the back plate and it's a bit too big |
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TomTom
Average Member
Kyrgyzstan
596 Posts |
Posted - 12 January 2012 : 20:45:51
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hmm you might have got a predicament then. Another thing to try is a torx bit, sometimes they can bite when a hex driver wont.
Another idea but it will be fiddly is to get a left handed drill bit small enough to fit in where the hex was on the grub screw and drill into it, hoping that the drill bit will bite and wind the screw out. Bit industrial though for an RC car, and I doubt you will have said drill bits to hand? |
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davecorah
Junior Member
United Kingdom
342 Posts |
Posted - 12 January 2012 : 21:37:45
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as tom said try a torx driver or an imperial hex driver, other that its cut into the pinion were the grub screw is with your dremel until the grub screw is gone, kills your pinion but at least its off the motor, dont think a left handed drill would work at 1.5mm would be too fragile,
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hpi_guy
Junior Member
United Kingdom
401 Posts |
Posted - 12 January 2012 : 23:07:31
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| What about drilling the pinion out then re threading it? |
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grasshopper
Senior Member
1652 Posts |
Posted - 12 January 2012 : 23:38:38
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Anything idea to force something larger into the hexagonal hole tends to spread the grub screw making it tighter and compounding your problem.
If you have the correct size of hex driver, stick it in your freezer for an hour - sometimes - if you have access to a micro blow torch - you can heat the grub screw and surrounding area up then stick the hex driver in and work it loose that way. Better if it's an aluminium pinion gear.
The other way is to 'dremel' it off as previously suggested - get the biggest diameter slitting disc (wear goggles) and cut across the pinion bush and into the grub screw - once you've got a 2 or 3 mm depth slot in the grub screw use a decent screwdriver and it should come out - if done properly the pinion will still be usable.
I'm not suggesting you have, but despite what instructions may say, I never use any form of threadlock on pinions as this problem will happen more often.
Drilling the pinion is an option but you'd have to re-tap and use a larger grub screw - unless of course you drill a new hole.... |
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frecklychimp
Average Member
852 Posts |
Posted - 13 January 2012 : 01:34:10
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I would be more concerned with not damaging a motor than wrecking a £5 consumable pinion and learning from mistake... have had to accept that cars eat through pinions and spur gears racing on astro/sand these days, killing at least either one at a big meeting
You will be need to be competent with dremel and lucky to cut a decent slot in a small grub screw enough to use a slotted screwdriver... its a trick that works well on screws/bolts but they have more meat on head to slot into, worth a try though.
if that doesn't work then Dremelling length ways across pinion and opening it up with bigger bladed screwdriver to split it would be first method
you could use a 2/3mm drill bit and drill through the grub screw and hopefully it will break up but try to avoid marking/damaging the motor shaft
Don't pull on pinion with any force or you will damage motor bearings. |
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David Smeaton
New Member
United Kingdom
81 Posts |
Posted - 13 January 2012 : 13:35:39
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If you can, remove the motor.
clamp it in a vice by the PINION, leaving the motor free.
apply a small amount of penitrating oil into the pinion end and leave it to drain down the shaft.
GENTLY using a pin punch tap the shaft to remove it from the pinion.
you might be lucky and the grub screw will come out and re-use the pinion. |
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