|   Heal my ignorance...brake rotor bolt size and thread? | Bianchi4Me
Jun 4, 2002 8:17 AM | | Not exactly a wheel related question, but sorta. I wanna rig up a test fixture to do comparative stiffness testing on various spoke and lacing combos. I was thinking what I could do is just use a standard disc brake hub, and mount it to the fixture using the brake rotor bolt holes. That way I'd have the hub affixed pretty solidly to the fixture, without having to a whole bunch of work machining a seat for the hubshell. I could just get a thickish hunk of aluminum bar, and use a rotor as the template, so no measuring. Drill 6 appropriate size holes and tap them with the appropriate threads, drill a big center hole to provide clearance for the end of the hub to slip into, and then clamp the bar into my bench vise. Figured I'd use aluminum because cutting the big clearance hole would be tough in steel.
So, what size metric tap do I need to cut some threads for this thing? |
| 5mm x 0.8mm | Calvin Jones-Park Tool
Jun 4, 2002 9:34 AM | | These threads are 5mm x 0.8mm, and typically 10 to 12mm long. The drill tap size is 4.2mm. That is a fairly odd size, and a 5/32" gets the job done, but is a bit smaller. |
| Bottle cage bolt threads... | DeeEight
Jun 4, 2002 9:38 AM | | which would be M4x1.0 I think.
Ya know, you could just take some taps, and see which one threads into a disc hub easily. :) |
| So,,, I'm confused | Big J
Jun 5, 2002 8:22 PM | | Why do you have to tap the plate? don't you just want to mount it
like a rotor? If you tap the plate you will strip out those threads
when you tighten it to the hub.
May be I just don't see what type of device you are making.
Help me out if you have the time.
Later
J |
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