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Guypie's Bike Builds - A paint job and more!


Guypie

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So once the mill had a VFD bolted to the side I welded in a sleeve for the main pivot and bored out the bearing pockets. I very nearly stuffed it up by trying to take to light a cut but with some advice from @Geophy I managed to get an acceptable surface finish and clearance for the bearings.

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Mocked it up on the drawing and it was looking pretty good! The pivot location had moved a little bit from the original design but I changed my linkage x3 save to match and it didn't look like it will cause any issues. This is why next time I will bore the pivot hole after welding the triangle together. Though I didn't have the mill running at the time either so not sure how I would have done it anyway.

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I didn't want to invest too heavily in this bike so its mostly made of stuff I had already. When I ordered the tube for bike #1 I ordered extra so I already had the top tube , seat stays, chain stays and seat tube. I ordered a length of 44x.9mm 4130 for the down tube. The wheels are an old 26" set that I already had, the fork is one we got free off facebook ages ago. The shock is also one I already had. I will probably be looking to upgrade the fork once I finish the bike as it is a damper rod/ orifice style which doesn't have speed sensitive damping. So if anyone has a boxxer/fox 40/rcv888/dorado or prettymuch any 200mm double crown fork with shimmed damper you want rid of let me know.

Next up I needed to make a jig for the rear triangle. This is what I came up with:

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The dropouts are from bike fab supply because making my own last time took way too long and these were pretty cheap

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  • 3 months later...

Finally got round to taking some pics after the paint job on this bike. Also, a few spec changes. Got an old boxxer WC and a fox van rc coil shock, both solid upgrades. Bicycle rides very well, life is good. Also made a 3d printed chain slap prevention thingee, its a bit ugly in yellow so I will probably redo it in a silver at some point cause I have some silver filament now.

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The paint job is a 3 tone fade, mazda starlight silver>1988 GM corvette gunmetal grey>black topped off with 2k clearcoat. I prettymuch use the bike like you would use an enduro bike since it pedals pretty well and it has been getting regular use up Pirongia.

Anyway, since then the bike building shannanigans have been ongoing. I decided its finally time to make a jig since the milling machine is now available for use, so I ordered a slab of ali plate and some extrusions and got stuck in...

 

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I didn't take photos of all the steps but here's a few of the highlights. I started off by bolting a 4080 extrusion to a 40120 at right angles for y and x axies (axises?axes?) and milled an arc into some plate to make the head tube angle plate. then milled and bolted some L shapes together for the headtube standoffs with a cone on the top end for centring and a stepped platform on the lower to make it easier to measure the lower edge of the headtube. I figured the lower edge was more important as fork length is more critical to the frame design vs stack height which is usually adjusted to suit the rider with stem choice/headset spacers/bar rise etc.

The L brackets have alignment dowels to keep them in line with the t slot underneath.

 

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Seat tube plate was basically more of the same though I simplified the design a little with a horizontal slot instead of an arc.

 

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Next I made a small legless llama another L bracket thing for centring the open end of the seatube. 

 

 

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Almost immediately this happened:

 

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Wow a jig makes life so much easier. that front end went together in a matter of 3 or so hours without even trying to be efficient. Bike number 3 was underway and the jig wasn't even complete!

 

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