Cooper S Drive Flange, Screws Not Recessed Sufficiently
#1
Posted 19 June 2018 - 03:05 PM
#2
Posted 19 June 2018 - 03:34 PM
that is A fix the other is to check that the screws are correct.
#3
Posted 19 June 2018 - 03:37 PM
#4
Posted 19 June 2018 - 05:44 PM
#5
Posted 19 June 2018 - 07:51 PM
Here are pics. Anyone spot what is wrong?
Attached Files
#6
Posted 19 June 2018 - 08:02 PM
that screw has not been seating correctly. something is not right.
#7
Posted 19 June 2018 - 08:12 PM
Does the machining for the screw hole look uneven / not square to you? Does to me.
Edited by mattcave, 20 June 2018 - 01:26 AM.
#8
Posted 19 June 2018 - 08:26 PM
i am more interested in the witness mark on the screw stand it on the head and photo straight down to show the pattern on the taper face.
#9
Posted 19 June 2018 - 08:29 PM
It’s hard to tell, but the drive flange doesn’t look to be seated as far into the disc as I’d expect.
Put a washer and plain nut on each stud and wind them up - see if it pulls the disc and flange closer together. Then put the screws in tight.
Edited by GraemeC, 19 June 2018 - 08:30 PM.
#10
Posted 19 June 2018 - 08:35 PM
Here are the marks on the screw....
Attached Files
#11
Posted 19 June 2018 - 08:37 PM
Screws were tight. Like, driven in with a ratchet rather than a screwdriver, and needed a ratchet to remove them again.
The other side of the car doesn't have the same problem, and the machining for the countersunk screws is visibly wider (and hence deeper)...
#12
Posted 19 June 2018 - 08:50 PM
rather poor resolution but i would say it is central. but i would say the countersink angle is possibly wrong. as there should not be a witness mark like that if it was face on face and not face on edge.
i would run a quality countersink tool in to the current ones to rectify the issue.
someone like Spider would confirm the angle etc.
#13
Posted 19 June 2018 - 08:57 PM
The flange could be badly made. Where are they from? If they are from MiniSpares you could PM Simon on here and see if he is willing to exchange and take that flange back for investigation.
#14
Posted 19 June 2018 - 09:14 PM
The countersink looks like its been chattering in the hole when it was being cut. This is normally down to the hole being too large for the pilot on the countersinking bit. So i would suggest the countersink is slightly offset. Next you need to find out whether that is a 100 or 90 degree countersink.
Judging by the hole it does not appear to be knife edged so still a bit of meat left to cut a fraction more off.
So if you are going to touch that you need to accurately measure the hole and the degree of cut.
#15
Posted 20 June 2018 - 01:25 AM
Thanks everyone. From visual inspection the angle of the countersunk seat looks to be noticeably wider than the angle of the screw (eg countersink is ~100 degrees, screw is 90?). That would explain the marks on the screw.
I've PM'd Simon@minispares to see what he thinks.
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