Long term Triumph Chopper project

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TriNortchopz
Posts: 73
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: Long term Triumph Chopper project

Post by TriNortchopz » Mon Jan 06, 2020 7:12 am

Nice, looks like the machinist did a good job centering on the tubing for boring. Interested to see the next steps! Chopper New Year!!

El Skitzo
Posts: 788
Joined: Wed Sep 30, 2009 6:40 pm
Location: Perth, WA

Re: Long term Triumph Chopper project

Post by El Skitzo » Mon Feb 10, 2020 11:26 am

I've just received a picture of the first mockup of the frame. So I'm looking forward to seeing it on the weekend to take it all in and check a few measurements. Apparently Tom took a little rake out of it just to make sure we are definitely within the 550mm rule, so we'll have to check that and how much trail we have now.

Please note this is just a mockup, and the tubing used is not what will be welded into place. The pie cuts at the bends are purely to workout angles and see how it all ties together, quickly and easily and to allow some easy adjustment. We have extra tubing to make the correct bends once the mockup dimensions are finalized.

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'65 Triumph Chopper (project)
'64 Triumph Chopper (project)

Prof
Founder, Choppers Australia
Posts: 5938
Joined: Sat Oct 22, 2005 3:54 pm
Location: Willunga, South Australia
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Re: Long term Triumph Chopper project

Post by Prof » Sat Feb 22, 2020 6:42 pm

Have you considered shortening the bottom link for regio and then putting correct length back to allow you some extra rake. You definitely want to get as much trail as you can... at least 5" .
Chopit'nrideit... Prof

El Skitzo
Posts: 788
Joined: Wed Sep 30, 2009 6:40 pm
Location: Perth, WA

Re: Long term Triumph Chopper project

Post by El Skitzo » Wed Mar 25, 2020 8:35 pm

Once the frame mockup had checked out, and we were happy with all the measurements, it was time to proceed to the next step.

I took the mockup tubing away and had the bends replicated exactly in a CNC bending machine, so our chromoly tubing has mandrel bends in all the right places.

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Then once Tom had trimmed everything to fit, chamfered the tube ends and press fit the frame slugs into position, it was locked down in a jig and checked for straightness.

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Then the whole lot was TIG welded together, including a new crush tube at the top of the seat post for the top of the hardtail to bolt too.

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And now you can see how the finished frame is going to look

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And to show just how much has changed, here's the modified front frame loop placed next to a stock one. Our Chopper frame loop has been stretch up 5", pushed out 2" and has an additional 5 degrees of rake over stock.

The next step is getting a comprehensive x-ray certification report of all the welds to satisfy the Transport Department.

Image
'65 Triumph Chopper (project)
'64 Triumph Chopper (project)

Prof
Founder, Choppers Australia
Posts: 5938
Joined: Sat Oct 22, 2005 3:54 pm
Location: Willunga, South Australia
Contact:

Re: Long term Triumph Chopper project

Post by Prof » Fri Mar 27, 2020 10:59 am

Getting there. Amazing that fresh welds have to be x rayed! In SA the engineer's physical inspection is all that is required.
Chopit'nrideit... Prof

El Skitzo
Posts: 788
Joined: Wed Sep 30, 2009 6:40 pm
Location: Perth, WA

Re: Long term Triumph Chopper project

Post by El Skitzo » Fri Mar 27, 2020 11:13 am

I know the x-raying is a pain in the butt and it's going to be expensive, probably set me back around $800 or so.

But the Transport Department has specifically asked for this, so I have no choice, especially considering my biggest goal with this project is to follow all their steps and get full registration in a completely transparent and above board way.
'65 Triumph Chopper (project)
'64 Triumph Chopper (project)

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