WANTED: Someone with a lathe!
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We_are_Stevo
Old School Grand Master
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Would you be able to replicate in alloy the black plastic rod from a Manitou 3/4 ??
We_are_Stevo
Old School Grand Master
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Chute55uk":3io0ew9o said:
The two black plastic shafts arrowed in the (somewhat poor quality)pic below...
...I could send you one to copy/modify??
Hmmm maybe but I'm thinking a couple of things, 1. I reckon their plastic for a reason (flexibility) 2. I'm not sure ir something like that would be turned and it would move about somewhat making it almost impossible to stay dialled in on the tool but I will show the pic to the cnc guy and ask his opinion, someone else has asked me to make a steerer and I'm convinced long things like these would normally be pulled (extruded) rather than machined down from stock. But let me ask on Tuesday as the guy knows way more than me about suchness 
Ideally, those rods would be machined on a sliding head (swiss type) lathe to help maintain straightness, although they could be done on a conventional if they were held in a chuck or collet at one end with a centre at the other.
Steerer tubes can be machined (Thomson seatposts are) but are more likely extruded I would imagine. I've not seen enough different steerers to be properly informed! Again, I'd hold on one end in chuck or collet, centre (tailstop) in the other end to hold it rigid. Machine OD to size. Change workholding to collet to match new OD, drill through and face, reverse job, face to length. Could drill half way on each facing op depending on length of steerer and drills available.
Steerer tubes can be machined (Thomson seatposts are) but are more likely extruded I would imagine. I've not seen enough different steerers to be properly informed! Again, I'd hold on one end in chuck or collet, centre (tailstop) in the other end to hold it rigid. Machine OD to size. Change workholding to collet to match new OD, drill through and face, reverse job, face to length. Could drill half way on each facing op depending on length of steerer and drills available.
