Workshop life in Lacremò, making handmade custom steel frames, tacking and fillet brazing...

[lacremo-it]

Hello everybody,

here I am again, I will continue the making of a 29er MTB bicycle steel frameset, if you have lost it, here it is the first post.

I have promised you warm and here it is, the main character of the post it will be fire.

This one goes out to the one I love
This one goes out to the one I've left behind
A simple prop to occupy my time
This one goes out to the one I love
Fire

The One I Love,
R.E.M.

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At first, I am going to tack on the jig all the tubes together what I have done in the previous post. Technically, as tacking, it means to make different single welding, in this case, brazing points in the right position in the way to lock mobile elements before the fillet brazing process.

As I have written before the previous work it has been described here:

• Workshop life in Lacremò, making handmade custom steel frames, the beginning...

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TACKING SEAT TUBE

The very first tube that I am going to tack and then braze is the seat tube with the bottom bracket shell, first I tack, then I check on the surface plate, if needed I can correct and then I fillet braze, check and correct if needed again.

At the end it looks like the picture below:

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TACKING AND FILLET BRAZING FRONT TRIANGLE

Then I can tack on the jig the front tubes. My sequence is the down tube with head tube and down tube with seat tube. I check, I correct if needed then I tack the top tube and I fillet braze all together.

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As in the picture on the right side, at first I tack the down tube with the head tube on the jig and then I check planarity on the surface plate. In this case, there was already the top tube.

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Usually the tacking points are in the middle line of the tubes, in some cases, they are in other positions to compensate some little difformities and try to correct them.

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TACKING AND FILLET BRAZING THE REAR TRIANGLE

The rear triangle is the most complex part of the frame to make it.

Usually, this is my typical process:

• tacking chainstays
• check wheel clearance and crankset clearance
• tacking seatstays
• check again wheel clearance
• complete fillet brazing

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Showing in pictures, the first step is to tack the couple of chainsatys on the bottom braket shell, after tacking the dropouts as it shown on the first section picture.

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On the left It is shown the clearance wheel check, then the crankset check. then I can put the frame on the jig and close the rear triangle.

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On the left the last tacking points to close the rear triangle and the frameset in the jig.

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After this, I can take out the frameset from the jig for the last time, turn on the torch, I can adjust the torch flame take the rod on my left hand and fillet braze the rear triangle

In the opening picture you can see the end of the chapter and of the work day, I am tired of course, but really satisfied of the result.

All the best,

G.

Comments

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[lacremo-it]

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[ahidmuhajir]

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