Looking for a 24H DA 7700 front hub which ain't easy to find, but 12H hubs are more common. One seller suggested using a punch then drilling out the holes by hand. Is it that easy? I guess it doesn't need to be super accurate but it should look good.
Ideally I'd use a wise and a drill press..but only got a hand drill here https://cyclesaloon.wordpress.com/2014/12/12/drilling-extra-holes-in-front-hub/
Step one would be asking yourself if youre a ham fisted bafoon. If so, then don't.
If you're somewhat mechanically able and pay attention to the small details then sure.
I assume you'll need a small chamfer on the holes so I'd see if stepped drill bits are available in the size you need..2.4-2.6mm?
I've no idea how expensive old school Dura ace hubs are.
I'd wait for the 24h personally.
I've spent a lot of time drilling stuff for diy. Its never ever neat enough I'd drill a hard, curved metal hub successfully. I've not used a pillar drill for a looking time. That would make it more likely to succeed.
Can you get some time with a pillar drill?
Step one would be asking yourself if youre a ham fisted bafoon. If so, then don’t.
If you’re somewhat mechanically able and pay attention to the small details then sure.
I assume you’ll need a small chamfer on the holes so I’d see if stepped drill bits are available in the size you need..2.4-2.6mm?
Hehe, depends on the day..but I have worked on handling extremely delicate and tiny structures to be scanned with electron microscopes so I can be OK.
I would need a 2.25 or 2.3 mm drill bit for the holes and 3 mm for the chamfer (measured my rear DA 7700 hub). Not sure I could find a suitable stepped bit..
I’ve no idea how expensive old school Dura ace hubs are.
I’d wait for the 24h personally.
I’ve spent a lot of time drilling stuff for diy. Its never ever neat enough I’d drill a hard, curved metal hub successfully. I’ve not used a pillar drill for a looking time. That would make it more likely to succeed.
Can you get some time with a pillar drill?
$100 NOS. I could get a cheap pillar drill esque holder and vice for a few pounds, not sure where I'd access one here in krakow.
Which hubs have only 12 holes?
Dura Ace FH 7700 came in down to 12H drilling..
I would need a 2.25 or 2.3 mm drill bit for the holes and 3 mm for the chamfer
I'd look for a centre drill with a 2.3mm tip. Then drill slightly deep and the angle of the body will give the chamfer. Also a centre drill is less likely to wander.
I'd say give it a go. I've made a few hubs from scratch and the drilling has looked ok. Easier with a drill press but should be possible by hand if you go steady
I'm a ham fisted idiot and I can use a SEM.
Be better done on a lathe.
I’m a ham fisted idiot and I can use a SEM.
It's not using the microscope, it was the sample handling.
Be better done on a lathe.
Not really. You'd need a large 4 jaw chuck and have to index every hole manually. A rotary table with a chuck, on the mill would be best.
I’m going with no, it doesn’t sound like a sensible idea.
But go for it and prove us wrong. You must promise to show us the results regardless of success or failure.
I wouldn't try it without a milling machine & rotary table (and the experience to use it).
Can get one of these w the vice for 28 quid..should be good enough, very high precision not req. A mill would be best, but don't have access to those anymore (I did in my TEM days, plus access to a nice CNC).
I can't quote - but tbf my samples are generally quite robust.
Butterfly proboscis are the most delicate things I've "worked" with.
I don't quite follow the "by hand" bit.
You're buying a pretty blingy, vintage hub then breaking out the black & decker?
If it's worth doing, it's worth doing properly find a machinist with a mill and a dividing head, or just hold on and find a 24h hub it's probably cheaper...
was working on sub 1x1 mm large samples w 30 micron wide protrusion that had with nanometer thick electron transparent carbon coats on top with DNA base specifically tagged w palladium clusters on top of that again.
Usually used a dissecting microscope to handle the samples, I think most people can do fine motor work as long as they take their time.
I don’t quite follow the “by hand” bit.
Yeah but with a jig like the one above seems like an OK idea.
I would do, but I have a mill and rotary table.
DIY able by hand, I would mark the PCD by scribing from the flange edge or hub centre, mark centres between existing holes, center punch and drill. Could do it by hand if you use a drill regularly, drill press would make it easier.
There are a pair of older 24h DA hubs on eBay now. Lovely hubs!
Thanks! looking for slightly newer DA hubs, got a bargain for a new 28h rear RH 7700 so looking for a front FH 7700 🙂
I'd quite happily do it by hand. Me and plenty of others have made entire frames with nothing more than a hacksaw and file (plus something to stick it together with).
Using a centre drill is a very good suggestion - probably the single best bit of advice to take from this thread.
very high precision not req.
Yep, as along as they're within spec, just go for it, the hub's going to be boggo ali, so no drama there, I'd even hazard a guess that the hub's the same blank regardless of how many drilling it has in the end.
Hardest part will be finding the right drill size I'd have thought.