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cat
Joined: 30 Nov 2005
Posts: 398
Location: South Africa
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 Posted: Tue Mar 21, 2006 2:15 pm Post subject: |
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| keithcross wrote: | Or you could find the centre of the swinging arm boly with an engineers square, fit a point to one end of a piece of string and a pen to the other. Mark one place on each side of the swinging arm with the pen, then put measured marks from this datum 
I know, you all think I'm a cheapskte, maybe I am, but you should only need to do this once.
Keith |
What's an engineers square? 
I found some centre finder things in a catalog but they're for lathes and milling machines. Quite nifty, they have a sort of eccentric - you probably know them - centre and you move it around on the end of the work piece until the rotating end-piece - that has a point - is concentric with the other part. [..shees, what a useless description.]
But I get your point about..measuring once / making a mark, so you dont' have to do it again. All the time I was thinking about something that would have to measure from the swingarm pivot every time. |
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keithcross
Joined: 20 May 2004
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Location: Hampshire England
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cat
Joined: 30 Nov 2005
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Location: South Africa
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| Posted: Tue Mar 21, 2006 3:53 pm Post subject: |
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oh. I've got one of those, but it doesn't have the thing at the left or the protractor in the middle. How do you find the centre of a shaft with it? With that V-thing at the left? |
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keithcross
Joined: 20 May 2004
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Location: Hampshire England
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| Posted: Tue Mar 21, 2006 5:14 pm Post subject: |
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Cat
Yes that the thing to use. The square itself can also be used with a little inginuity as well. Cant rember how we did this when I was an apprentice, but it is possible
Keith
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DEmark
Joined: 30 Dec 2003
Posts: 218
Location: Maryland USA
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| Posted: Tue Mar 21, 2006 7:12 pm Post subject: |
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| I just chocked my axle up in the lathe and drilled a shallow hole with a center drill to find center. Have not done the swingarm bolt yet.... |
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Fil
Joined: 22 Jul 2005
Posts: 144
Location: Shropshire, England
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| Posted: Thu Mar 23, 2006 4:44 pm Post subject: |
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I have constructed a very simple device to centre my back wheel.
It consists of a long straight steel tube (about 10mm diameter, and slightly longer than the distance between the swingarm pivot bolt and the rear axle bolt) with two fuel pipe hose clamps - one slid onto the tube at each end.
The clamps have long screws that protrude so that you can use the end of the screw to centre on the swingarm pivot bolt at one end, and the centre of the rear axle bolt at the other. You can simply measure the distance on one side (by sliding one of the hose clamps to the correct place), and check that the other side is the same.
I have marked the centre of the swingarm bolt with a centre punch, and the centre of the rear axle already has a small dimple each side.
I also find it easier if I undo the read brake pedal pivot so that I can reach the swingarm pivot bolt easily with my measuring stick  |
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keithcross
Joined: 20 May 2004
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Location: Hampshire England
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| Posted: Thu Mar 23, 2006 5:28 pm Post subject: |
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Tried my idea yesterday when fitting a new chain and sprockets. Swinging arm pivot was centred one side, matk the other side with a punch. Use a piece of wire, tied one end around centre punch and tied the other end around a pen. Marked one place each side of swining arm and made further marks 5mm apart from this mark. Should be easy know
Keith
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cat
Joined: 30 Nov 2005
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Location: South Africa
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| Posted: Fri Mar 24, 2006 12:59 am Post subject: |
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| Fil wrote: | I have constructed a very simple device to centre my back wheel.
It consists of a long straight steel tube (about 10mm diameter, and slightly longer than the distance between the swingarm pivot bolt and the rear axle bolt) with two fuel pipe hose clamps - one slid onto the tube at each end.
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ah! good one! I have a piece of aluminium tube,..hose clamps, I just need to get the centre of the swingarm. |
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cat
Joined: 30 Nov 2005
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Location: South Africa
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| Posted: Sat Apr 22, 2006 10:33 pm Post subject: |
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andyw
Joined: 14 Mar 2006
Posts: 89
Location: UK South West
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| Posted: Sun Apr 23, 2006 12:14 pm Post subject: |
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| Fil wrote: | I have constructed a very simple device to centre my back wheel.
It consists of a long straight steel tube (about 10mm diameter, and slightly longer than the distance between the swingarm pivot bolt and the rear axle bolt) with two fuel pipe hose clamps - one slid onto the tube at each end.
The clamps have long screws that protrude so that you can use the end of the screw to centre on the swingarm pivot bolt at one end, and the centre of the rear axle bolt at the other. You can simply measure the distance on one side (by sliding one of the hose clamps to the correct place), and check that the other side is the same.
I have marked the centre of the swingarm bolt with a centre punch, and the centre of the rear axle already has a small dimple each side.
I also find it easier if I undo the read brake pedal pivot so that I can reach the swingarm pivot bolt easily with my measuring stick |
Niceone Fil................maybe a photo?
.........and now the 'pro' version Cat - where did you find that?!
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cat
Joined: 30 Nov 2005
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Location: South Africa
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| Posted: Mon Apr 24, 2006 6:43 am Post subject: |
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| andyw wrote: | | Niceone Fil................maybe a photo? |
it's ingenious you could use any sort of sleeve that slid snugly over the tube, with a set screw to tighten it, it would be less fiddly than a hose clamp.
the picture shows a Muzzy's Precision Wheel Alignment Tool. google doesn't turn up much, just a few references to it in 2 sportbike forums, and muzzys.com itself. the only place you can get them is Muzzy's itself and they don't give the price, just "POA". the rod is graduated so you can also use it as a sag measure.
i need to do some more measuring - the last time i tried, it seemed like the swingarm bolt was partly behind something, so long pointers like the Muzzy's one wouldn't work. and why Fil's does. |
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