A Speedo Mount...

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Prof
Founder, Choppers Australia
Posts: 5622
Joined: Sat Oct 22, 2005 3:54 pm
Location: Willunga, South Australia
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A Speedo Mount...

Post by Prof » Tue Feb 09, 2016 9:02 pm

A customer needed a speedo mount for his newly chopped soft tail. Request was for it to be centrally mounted on the bars. To get it registered he needs the appropriate idiot lights, so I supplied a neat white faced mini speedo.

He told me the risers were short so the speedo needed to be angled so the speedo cable would clear the top triple tree but clear the bars... about this angle...
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Three mil stainless was settled on as the material of choice. Black texta beats engineer's blue. Here you can see we have measured how much material needs to be left around the bolt holes. You can see the faint lines where the distance has been scribed on the stainless. I use a dead verniers for this job...
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Centres of mounting holes have been marked, punched and drilled and the stainless folded slightly in the vice. Now the speedo location needs to be marked with a texta...
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Centre is accurately marked...
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... and a pattern previously made is used to locate speedo mounting holes and a hole large enough to accommodate the top cable nut...
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A piece of paper is used to measure (over the curve) the exact location of the holes so the speedo doesn't end up skew wiff...
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Odd shaped and bent brackets are hard to hold in a drill vice, so in this case the bracket is clamped to a piece of 50mm square rhs. Centre drilled first and then holes 1mm larger than the bolts to allow for final lineup. Drill bits wander so some leeway is always needed...
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Final shape relies on a bit of 'old school' geometry. A caliper or dead verniers is used to scribe arcs at the clearance we want...
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They are then joined by straight lines (tangents) that touch the edges of the arcs...
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Cut with a 1mm angle grinder blade, edges chamfered on the linishing machine and polished...
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Polished stainless doesn't have the same bluish shine of chrome, but looks just as good and won't chip or rust.

Owner was tickled pink. Time =2 hours.
Chopit'nrideit... Prof

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