Monday, November 17, 2008

Now for the fun part...

This was really exciting and absolutely scary as hell all at the same time... I decided even thought this is my first frame I wanted to do some nicer detail touches. So internal cable routing is one of them along with some other braze-on goodies.

After looking at some other builders designs and learning from what I could see in their production photo's I new to use internal brass tubing and braze in these ferels. I decided that I will try to do an internal fillet because there are some little gaps to fill since the angel of the ferels doesn't match the tubing cut/mitter very well. As you can see I loaded up the silver... I think it is either because I couldn't tell that the hole was filled or if the silver expanded a little after it cooled.

*** A side note*** take a look at the head tube... yeah it was the worst of all my joints because I wanted to make sure there was silver going into the mitter... but I also got some gaps in weird places... so I had to go back reheat and add silver... wow that is ugly!


So here I started to cut off the excess ferel to open up the inlet for the cable housing... I was very nervous because I really didn't know whatto expect.

More grinding and taking my time at that!


So after some filing and triming of the inside... it doesn't look to bad?


Well this was well worth the experience because I am more than happy with the outcome, even though the holes aren't the same size or length they do match up well enough that I will put braze-on internal cable covers and it will look spectacular. Don't get me wrong I want to leave these open because with paint on them you would barely be able to notice the the slight alingment issue... but with brased on covers over the holes I will be able to align them perfectly and symetrically. I will work on a way to match the holes up so they will be able to be left un covered to give a cleaner look.


I really wish I could get a shot if the internal fillet, it came out really nice.
I definately learned alot with this round of brazing, I also feel that filling gaps with 56% silver is much easier than working with brass rod. and I will really focus on taking my time in heating and watching the temps on the next round of brazing as well as keeping the silver in the right place. I did a little reading online and figured out a few things I was doing wrong and to help keep everything much cleaner. I eventually want to be able to braze well enough to just clear coat a frame and showoff the seams.

1 comment:

Unknown said...

Good luck Mark! Keep having fun with it, you're doing great.
Craig

The lessons I am learning are amazing and really fun to work out...

The pictures below are the work I did last night, finished grinding the bottom bracket sockets.
Notched out the seat stays to fit the drop outs...
And the big big moment... doing my 1st miter on the seat tube (Tim calls this one the most forgiving miter and he is right)

I think that many of the lessons and techniques I have learned from wood working are carrying over into metal working very nicely.

bottom bracket, right side done (before finshing sanding)

bottom bracket, right side done (before finshing sanding)
the left socket is just starting to get ground, notice how thin the walls of the right socket have gotten. there is a lesson there and you will see in following pics!

grinding with a stone

grinding with a stone
it took a while with this stone but with the tight corners I had to use it because I only have one small sand paper bit left

ooh ahhh... a little sparks flyin

ooh ahhh... a little sparks flyin
That lesson I spoke of earlier is happening in this pic...

Ahhh... oh DOH!

Ahhh... oh DOH!
is that blueing? Yup that is the lesson that I learned on this socket. the grinding stone heats the metal very fast and as that wall gt thinner it started blueing. Bad, bad, bad! so I will have to sand and reshape that wall a little because I even got some chipping around the blue.

Chain stays with the drop outs notched in...

Chain stays with the drop outs notched in...
So this one was a little scary because I wasn't sure if I would get them straight and true... it ended up ok but I can do better.

Notching wasn't to hard but keeping everything even was hard

Notching wasn't to hard but keeping everything even was hard
I decided to try the bevel sides on the notch, I think I can do better so I may do the stays again?

The big moment... my first miter!

The big moment... my first miter!
I should have taken some before during and after shots but this went pretty fast actually. this is the ruff cut, I rounded it out better and got rid of that hump on the back wall

A little different angle... check out my home made tube holder... works like a charm!

A little different angle... check out my home made tube holder... works like a charm!
I am so proud of the wood block tube holder... now I just have to make the other sizes

A quick fit test...

A quick fit test...
Not bad forthe 1st miter and fit check... I only need to file the inside edges to match the bevel of the inside of the BB

Nother fit check after some finishing

Nother fit check after some finishing
still need to angle the inside of the edges then it is done and ready for finihsing before brazing. I also still need to finish the socket wall to clean up any uneven edges or tooling marks