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Thread: Removing blind rolled pin
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14th Jan 2019, 12:09 AM #1Most Valued Member
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Removing blind rolled pin
What's the best way to remove a blind rolled pin.
I have a handle from a mates electric wheel chair, only does half a turn and has been sheared off. Thread size is 1/4"UNC and the rolled pin would be about 2.5mm
The handle is threaded internally, then to hold the threaded piece in place, they've installed a rolled pin, not all the way through, but about half way.
Blind Rolled Pin2.jpgBlind rolled pin.jpg
Hopefully the pics will explain it better.
Thanks in advance.
KrynTo grow old is mandatory, growing up is optional.
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14th Jan 2019, 12:46 AM #2China
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A old tap of the appropriate size screwed in, then gently work the pin out with vice grips taping with soft face hammer, i did this on camera tripod for a mate a couple of years ago handle was plastic so could use any heat easy out might work as well
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14th Jan 2019, 06:57 AM #3Philomath in training
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I'd look at replacing it with a grubscrew or similar when it is out too.
Michael
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14th Jan 2019, 10:47 AM #4Intermediate Member
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Just a thought if China's good suggestions are unsuccessfully implemented:
Drill through the handle via the roll pin using the biggest drill possible i.e. so the roll pin is acting as a drill guide. Then reversing the set-up, drill a bigger hole back down to the roll pin, the drill size only being enough to allow an appropriately sized pin punch to engage the roll pin's inner diameter, so as to then drive it out.
This will leave an extra hole, but one which would allow removal of the roll pin if required.
One of those designs that tells you it is either planned obsolescence or inadequate engineering.
Michael's suggestion is also good in this situation, since the threaded bolt/stud? appears insubstantial for something that appears to be used regularly
Regards
QuentinLast edited by Cueball; 14th Jan 2019 at 11:00 AM. Reason: Incorrect reference
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15th Jan 2019, 12:04 AM #5Most Valued Member
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Thanks Quentin, that's probably the only way to get it out, as I don't have an ezyout or a tap small enough to use Chinas suggestion.
Will use that idea, if I come across another Engineering FUBAR. Thanks China.
Michael's suggestion is also good in this situation, since the threaded bolt/stud? appears insubstantial for something that appears to be used regularly
So no doubt, there will be more accidents like this.
This mate suffered a stroke at the age of 32, blind in one eye, partially blind in the other, only just has use of his right arm/hand, has a real bad speech impediment, and can't use his legs, plus has very poor control over the joystick. The controller is set too fine, but they won't change it????
Unfortunately the "engineers" that design some of this equipment, I don't think have any real idea as to the design faults they create.
Thanks again everyone.
KrynTo grow old is mandatory, growing up is optional.
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15th Jan 2019, 05:12 AM #6Senior Member
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If you have a side hammer you can try screwing a good sheet metal screw into the roll pin, hook on to the screw and pull the pin out.
One other remote possibility is to fill the roll pin with grease. Put a pin punch in the roll pin and hit it with a hammer. It might hydraulic the pin out. More likely squirt grease back out the slot into your face. I said it was a remote possibility.
Pete
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15th Jan 2019, 05:08 PM #7Most Valued Member
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It is highly likely that they wont change the settings coz they don't know how.
I think to adjust the joystick controller you need a PP1 programmer, or at least someone that has one, so it might be worth ringing around the wheelchair repairers.
Or second option could be a new joystick controller with the buttons that allow you to slow it down for indoor use and then speed it up for the drag strip.
You will need to know if it is a brushed or brushless controller and have a look on aliexpress.
cheers, shed
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15th Jan 2019, 09:24 PM #8Most Valued Member
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Thanks Shed, biggest problem is that he gets a new chair every 2 years, and NO ONE is supposed to deal with it, so I'm loath to modify the electrics.
When he has a problem with it, he has to ring DomCare and they then organise someone to deal with it. Biggest problem is that in usual circumstances the wheels turn very slowly.
On a Saturday recently, his new chair that he had for about 3 weeks, both castor wheels had lost their nuts, him beng partially blind didn't notice them missing until both bolts had worked thier way out, leaving him stuck in the middle of his lounge room, unable to go anywhere!!!!!
Fortunately I managed to find a couple of nuts to fit the bolts, when he reported what had happened, he was told that I was having him on, but I noticed 2 new nyloc nuts were fitted to it????
I've had to tow him out of a small sand bog on the side of the footpath, as the castors holding the wheels were bent, and it wouldnt go straight, the arm rests have had to be repaired, the bolts that hold the arm that holds the control box and joy stick have been stripped out of the aluminium block, this was fixed by fitting a couple of helicoils, the list goes on and on.
KrynTo grow old is mandatory, growing up is optional.
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