good day dear community,
i am in the mid of creating a bike-frame-jig.
the model is oriented at tanner w s jig:
https://www.instructables.com/id/Bic...-Building-Jig/
see some the parts (here as Acronyms ) he is using:
HT - Head Tube
ST - Seat Tube
TT - Top Tube
DT - Down Tube
BB - Bottom Bracket
CS - Chain Stay
SS - Seat Stay
note: i found two or three very interesting "hacks" of Tanner W: see the following pictures:
modifications made by Kristofer Henry
a. HT Assembly - The
standoffs sit 45 deg.
https://www.flickr.com/photos/blackc...7715964842548/
btw see b. tanner w
https://www.instructables.com/id/Bic...-Building-Jig/
So here is the HT Assembly pretty much put together with the exception of the bottom "puck" holder and purge fittings. The standoffs sit 45 deg. back from the centerline of the extrusion. This allows me to have access to both sides of the HT/TT/DT area. I'll mount both standoff's on a rotary table and radius the ends to make my hands happy. Now that it is assembled, and I've had some time to stare at it long enough, I'm thinking I may change how the bottom standoff is mounted so it is fixed to the bottom of the extrusion and the whole assembly rotates off of it. Taking a measurement from the top of the main beam will enable an exact measurement to locate the bottom of the HT in space which will be nice.
and see the following discussion:
Francois Cau: What did you use for the pivot point of the extrusion part ? Is it just a simple screw ? (I'm trying to find a good/precise solutions for Rev2.0 of my jig...)
Kristofer Henry: There is a shoulder bolt that rides on a pressed in bearing. It's pretty smooth and clamping action is good.
queston: - very very interesting .- Why did you change the standoff - with a 45 degree-skip?! Can you compare it with a standard - standoff
another hack: by kolb-Rahmenbau.ch
https://www.flickr.com/photos/186428...th/3228571003/
he uses a very very big plate - see the right side of the spine ...: the plate for the head tube assembly is very very big - much bigger than that one that Tanner W uses.
i guess that this is much more precicely .. he can work with a lower degree of measurement-failures
how do you see this !?
what do you think !?
What else do you like at this bike-frame-jig !? I think it is very very interesting - if we compare it with tanner ws jig!?
look forward to hear form you
yours Apollodriver
btw: see also this arctos jig:
http://photos1.blogger.com/blogger/7...AD-drawing.jpg
https://amhoov.org/2019/08/06/bicycl...lding-the-jig/
see a modified jig - by #diy #bicycleframe #fixedgear
Bicycle Frame Build 10 - Frame Jig Pt.02 - Machining Extrusion
Francois Cau::What did you use for the pivot point of the extrusion part ? Is it just a simple screw ? (I'm trying to find a good/precise solutions for Rev2.0 of my jig...)
Kristofer Henry: There is a shoulder bolt that rides on a pressed in bearing. It's pretty smooth and clamping action is good.