Recent content by Betsy

Does this mean you’re finally going into the much fabled shed @Hotwheels. ?

If you want to understand the full process.. Ask about the cold forging of the square taper.. this needs to be punched in from the back of the crank, hence the machining allowance behind for clean up. I guess this will be forged before reaming out and threading the opposite side? also, is the...

Anytime..

£12,000 cheaper from Japan :cool: https://zenmarket.jp/en/auction.aspx?itemCode=c1173681938

I begrudgingly accept your half arsed apology..

Yeah.. thanks for the insight! We was literally telling you if was a forging from Pg1 .. retrobate was blue in the face, I was pulling my hair out.. did we get any recognition?.. oh no.. it’s just “Thanks Caj, we’d be clueless without you Caj.. we’ve only got them useless fks @retrobate and...

It had a guard .. it’s a piece of hardboard, inserted into a piece of ply 😁 Yes, you can use the stylus manually to plough off material then when you get close to finished size you can set the auto-feed and the bed moves left/right.. up/down with the stylus tracing the shape while the...

Morning @Lucidone .. it’s an Alexander 4HB I’ve still got all the instructions manuals, catalogues, parts lists, original bill of sale and a die making instruction manual issued by the Engineering Industry Training Board for Engineering Craftsmen no less :cool: Operating the stylus This...

Quite.. i used to make tooling around the same era these cranks were manufactured (in the days before CNC) we had a machine called an Alexander Die Sinker / Copier. I would make a pattern of (lets say) the crank, then cast a PU mould around it, remove the pattern so i would have a negative of...

Ear defenders?

Ahhhh! It's not a casting.. do we have a 'pulling ones hair out' emoji? 😁

Oh.. i give up 😁

It's not CNC it's forged from a die.. like this.. you can even see the flashing created around the shape The section where the thread goes for the pedal is built up into a flat surface because they will not drill into a dome surface.. the forging then has the flashing removed, it's linished...

This is the crank in question This is the eBay forging If you cut around the shape of the crank^.. removing the flashing.. from the back.. it will look like this ..giving you this shape

Go for it Lee.. they didn't give a shit when i reported Nazi memorabilia being sold 😁 I think the seller probably does believe it is what he's claiming it to be.. probably bought at a flea market or sale and took the sales patter as gospel.. Without any knowledge of manufacturing processes...