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OT - tool to remove cap
02GF74 - 20/12/12 at 10:54 AM

How would you go about making a tool to remove this cap without damaging it?

overall diameter is 28 mm, recess is 14 mm.

Cover recess with cling film and then pack with epoxy resin/chopped glass fiber mat?



now if only I had a CNC or 3D printer....

liam.mccaffrey - 20/12/12 at 11:35 AM

I reckon you could vabricate somthing from 5 bits of bar welded on to a central pin.

Slater - 20/12/12 at 11:41 AM

screwdriver with some duct tape wrapped round the end to avoid metal bits contacting each other.........Locost style......

MikeR - 20/12/12 at 11:41 AM

figure out the size of the holes, cut down some bolts. Weld bolts onto bar. twist bar.

Technically you'd only need two bolts.

maccmike - 20/12/12 at 11:42 AM

round bar equal diameter to of the centre of cap.
5 small round bar equal to the 5 outer areas.
bit of welding and grinding.
jobs a good'n

tegwin - 20/12/12 at 11:43 AM

I have used large hex keys before with a piece of duct tape for padding on similar caps.

HowardB - 20/12/12 at 11:46 AM

I have used the two screwdriver technique,... one in one slot as a pivot, the other in across the cap as a lever. It would be possible to replicate as a bar with just two pins, or three if you were worried. Not all 5 are required.

hth

02GF74 - 20/12/12 at 11:51 AM

thanks - good job i asked - 5 aluminium pins held in some fashion would be the easiest

Jimfin - 20/12/12 at 12:44 PM

Tool for changing wheels on the angle grinder perhaps, difficult to gauge the dimensions from the photo, but could also be made to size with a bar an couple of bolts..

matt_gsxr - 20/12/12 at 01:41 PM

What about making a tool out of that plastic that you can melt in boiling water?

trextr7monkey - 20/12/12 at 02:16 PM

known a s polymorph
I think Iwould just drill hole centres througha bit of flat bar and drop some bolts through - either put a nut on back or a spot of weld on top, how tight are they?
Have a cnc machine that works with wood and pladstic (but not metal on a big scale0
ATB
mIKE

theprisioner - 20/12/12 at 03:04 PM

Digitise the shape using TuboCAD or AutoCAD then cut it out of the solid, simples!

nick205 - 20/12/12 at 04:00 PM

Looks a reasonably expensive part - is it for cycle brakes?

How much is the proper tool, might be cheaper in the long run to preserve the part. Don't foget you've got to do it back up again too.

MikeRJ - 20/12/12 at 06:24 PM

quote:
Originally posted by 02GF74
thanks - good job i asked - 5 aluminium pins held in some fashion would be the easiest


Work out the PCD of the 5 pins, mark out the end of a larger diameter alloy bar, drill five suitably sized holes for the pegs and drive the pegs in. Drill hole through the side of large alloy bar and insert a drive bar.

If they aren't hugely tight you may be able to whittle down a bit of hardwood and get the job done.

fazerruss - 20/12/12 at 07:53 PM

Easy, all you need is a milling machine , a lathe and a rotary table!

tomgregory2000 - 20/12/12 at 08:34 PM

That looks like a cap of a mountain bike brake calliper

Just like the hope one

Just buy the tool

02GF74 - 28/12/12 at 05:31 PM

quote:
Originally posted by tomgregory2000
That looks like a cap of a mountain bike brake calliper

Just like the hope one

Just buy the tool


easier said than done, searching the web has thrown up nothing hence why I asked.

BTW it is Formula R1 brake calliper.