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.
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.