DannyC
0
Hi Martin,Latest:
Front end on.
BB made up. Just needs assembling with bearings and crank.
Loong chain arrived from Ice trikes.
Making up the USS.
I've cut a section of tube off, did bother to measure, eyeballed as I didn't know if 1.75" was the tube length or the OAL with bearing cups, whatever!
Don't bother telling me now, I'm past it.
But I machined the weld off and faced the tube end up in a lathe. I noticed a piece of standard dia, 30mm (so could be 29.98mm) was a snug fit inside the tube.
So I used it as a mandrel, but it only went on so far, 8mm, brg cup sleeve depth.
Using the tailstock with a bung everything machined up nicely.
Tried fitting the brg cup it was a no go fit, thought it'll be out of round as that area was heavily welded (probably raleigh factory, Notts).
Made severely light cuts until I had a tight push fit.
The thing was really out of round (weld distortion) and had a EWR tube miss match, standard for ERW.
I do know quite a lot about tubes in manufacture, bread and butter to my old firm.
Just wonder how others manage to cope with situations like this.
I can see people with 10lb hammers pounding away to get the thing to fit.
Anyway everything ended up nicely for me and all I need do is clean the paint off and weld the tube.
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More to follow.
Martin.
We all feel your pain and have (at one time or another) trodden this path.
Fun, isn't it?
I have twice now cheated with a 12mm Silver steel post inserted and welded into the boom and two 28x12x8mm bearings and an adjustable gooseneck. Clamps round the 28mm bearings and a top-cap with an M6 bolt and a SS washer on top to keep the dirt out has done the trick for me.