开云体育

George, You might want to have a quick look at

This dude: https://www.youtube.com/watch?v=e2BpFdXlXNI thinks they cloned a poor design or got the measurements wrong (imperial/metric screw-up), but they drill all the holes correctly sized for

Price & performance as usual. The old dynamos were pretty crap, and incandescent lamps didn’t help. Better than nothing though, and battery powered was worse. Today with neodymium magnets &

Yea, I bought that kit at the time I ordered the original blocks from amazon. I basically knew that the unthreaded holes dont always allow the threaded boots to go through but still thought I would

??? ??? Thats kinds funny how they had that technology for that & then dropped it for like 50? maybe more years & then brought it back . Like steering locks they had them in the 40's & dropped

I had a Raleigh bike that had a dyno hub in the front wheel. That was in the late '50s. IIRC, it wasn't a great light source. From memory, it was thinner & larger diameter than the pix in the

The blocks are thru-hardened; trying to run a tap into one is asking for a broken tap. Roy

I forgot to mention that the link John provided those threaded barrels in the kit can be bought at a lot of hardware stores from the bin marked furniture parts . I still need to see what threads the

??? ??? MY kids got me another set for Christmas from All Industrial Tool . I just pulled them out to check them out? The threaded holes I tried did work though a bit rough . I've seen a few

George, 123 blocks are machined, HARDENED, and ground to final dimension. Grinding on one freehand with a Dremel may not work out for you as expected. If you have a block with tapped holes, they

I've bee happy using this product: https://taytools.com/products/123-block-attachment-hardware-kit which is designed to be used on the import blocks which I have never found to have a usable thread

If you purchased imported 123 blocks it’s a hit n miss. If you’re looking for perfect 123 blocks you’ll need to spend some extra money and get them from a reputable manufacturer like Starrett

They used for setups and measuring. I have 6 123 blocks and mostly use set on mills. I have never use the tap holes but books will show the holes in use. Dave

How about talking 123 blocks. I'm a bit at a loss about them. Or the basic manufacturing of them and what's expected. I bought one set on amazon and it was awful.? Couldnt even screw in a bolt.

??? Yer pretty spot on both Tony & Bruce . Though I can't swear it was a Shimano? It's been several years now , but it must have been a pretty smooth operation for the shifting or I'd probably

??? Doesn't the front wheel spin just like the back wheel ? ??? animal

Primary power source is you pedalling. Not quite perpetual motion. He means a dynamo in the front hub to power the lights (a bit of a step up from the wheel driven ones), and a gear box in rear

Yes, it was the pedals, but one of these in the front wheel https://www.amazon.com/bicycle-dynamo-hub/s?k=bicycle+dynamo+hub and something like this in the rear instead of the usual derailleur and

"a generator in the front hub , transmission in the rear hub". Where was the primary power source?? Unless you're suggesting some sort of perpetual motion machine.? Wouldn't the generator be driven

Here a drawing on fine feed works on drill press too. Dave