New jig design
#1
Senior Member
Thread Starter
Join Date: Dec 2019
Posts: 950
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 321 Post(s)
Liked 261 Times
in
212 Posts
New jig design
So far seems to be working quite well. The design-goals here were to have something quite small that would go on the top of the table; be nice and solid to hold everything still; and have independent adjustment of HT spacing and angle, so that you can get each right one at a time. The ST is vertical at all times (the HT angle is relative). This simplifies the design and keeping things vertical is much better when getting the side-to-side alignment with a laser level box. There is nothing for the rear axle because I attach the CS first using this simple fixturing:
So here is the new jig (it looks all shiny like that because I painted it with owatrol):
So here is the new jig (it looks all shiny like that because I painted it with owatrol):
Likes For guy153:
#2
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,363
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,664 Times
in
2,497 Posts
I was thinking you could attach the chainstays first by swapping the seat tube around and then I read your text.
I'm making a chainstay fixture right now, attempting to only use things that are in my junk pile. I think I figured it out.
I'm making a chainstay fixture right now, attempting to only use things that are in my junk pile. I think I figured it out.
#3
Senior Member
Thread Starter
Join Date: Dec 2019
Posts: 950
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 321 Post(s)
Liked 261 Times
in
212 Posts
A follow-up with a couple more pictures showing the use of the laser:
Step 1: get it all nice and level. Note that the laser line has to pass through the centre of the rear axle as well as the centre of the BB shell. That means we're really on the centre plane of the bike.
So now step 2, without moving the laser, drop the seat tube down, so that the laser can see the HT. It's also sweet that with it rotated around the laser is still hitting the centre-line of the axle (although this isn't actually critical at this point-- what matters is just that the ST goes right back to exactly where it was).
Step 1: get it all nice and level. Note that the laser line has to pass through the centre of the rear axle as well as the centre of the BB shell. That means we're really on the centre plane of the bike.
So now step 2, without moving the laser, drop the seat tube down, so that the laser can see the HT. It's also sweet that with it rotated around the laser is still hitting the centre-line of the axle (although this isn't actually critical at this point-- what matters is just that the ST goes right back to exactly where it was).
#4
Senior Member
Thread Starter
Join Date: Dec 2019
Posts: 950
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 321 Post(s)
Liked 261 Times
in
212 Posts
I did fit the actual BB and chainrings after tacking those CS just to be sure though... You can't be too careful. This is a touring frame so a road-triple with a 68mm shell and 135mm rear spacing. Always a bit tight!
#5
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,363
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,664 Times
in
2,497 Posts
Where is the laser?
The theme of my new chainstay fixture is "everything is round if all you have (working) is a lathe"
The theme of my new chainstay fixture is "everything is round if all you have (working) is a lathe"
#6
Senior Member
Thread Starter
Join Date: Dec 2019
Posts: 950
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 321 Post(s)
Liked 261 Times
in
212 Posts
The laser is off to the right on a little adjustable stand type thing:
Likes For guy153:
#7
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,003
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4172 Post(s)
Liked 3,792 Times
in
2,271 Posts
All I can say is that your domestic partner must be very understanding in tolerating such a mess so close to the washer and dryer My wife would not be happy (and you know what they say about a happy wife). Andy
__________________
AndrewRStewart
AndrewRStewart
Likes For Andrew R Stewart:
#8
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,363
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,664 Times
in
2,497 Posts
I'm very fortunate to have such a tolerant spouse