Wasp slipper question

[rsj]

I've got a Wasp slipper which I think is complete. There's the main part which fits on layshaft and has a threaded square drive, the spring cup with square hole which fits over it, 5 spring cone washers then the domed nut. Both main part and cup are alloy. Question is can I run a tufnol spur gear in the slipper as it is or do I need to fit some kind of pads?
Thanks j

[terry.sc]

Sounds like you have the complete slipper there, they didn't use any slipper pads the spur gear was just clamped in the middle. Back then the slipper was more of a transmission protector rather than something designed to slip regularly, to absorb the shock loads when landing from jumps for example, so running on the spur was fine. Usually a nylon spur gear was used in these, but a tufnol spur should still have enough friction to give enough drive, but unlike nylon spurs you aren't going to melt it if the slipper is a little too loose.

[rsj]

Thanks for the reply Terry.
The way you explained it makes perfect sense considering the parts that are used. I was thinking these things were supposed to do the same job as a modern setup. Been looking at it again and I had also missed the lack of a bearing to centre the spur on the layshaft like a proper slipper has. Will use it as it was intended!
Cheers j

[masons01]

Hi there

Terry is completely correct with his explanation, in addition to this explanation is that after some testing with loosening the domed nut against the coned washers to get more slip (like todays slippers) it would undo itself!!!!!!!!!!!!!! therefore we changed the design a little to include a tapped hole in the domed nut to allow us to put a grub screw down it to lock it against the layshaft allowing it to slip alot more without the nut coming loose. Problem sorted.
Can't beat an M3 nyloc nut though like nowadys!!

Mark

[DerbyDan]

I assume this is what you have rsj?

Looks like mine has been modified with the grub screw as described... also can anyone tell me where the rubber 'O' ring goes or if it needed (I wonder if it was added to try to stop the loosening)

[G stote]

I don't think thay had the o ring washer?

[rsj]

Hi. Sorry for delay.
Thanks for the info Mark sounds promising. Have you had much use out of your slipper with it setup 'loose'? What material is your spur made of and has anything worn? I did the grub screw thing but not through testing, I thought the existing hole in the domed nut was yet another stripped thread so tapped it m3, looks like the hole might have been to tighten or loosen the nut using an allen key or driver?
Hi Gareth sorry to read your sad news in the other Wasp post but good to see so many people with fond memories of your father and the brand.
Hi DerbyDan, yes this is exactly what I've got, saw your pic's on another post on a google search, does look like someone was trying to use the o ring to stop it coming loose, as Gareth says don't think it should be there. Has yours got a grub screw and thread tapped in the nut too?
Keep thinking about this and would still like to be able to use the Wasp slipper like a modern slipper and with vintage runners being popular expect a few others would too. The friction side of things would be easy enough to sort out but would the lack of a bearing for the spur to spin on wear the shaft or centre of spur gear and cause pinion mesh problems? Because of the dimensions (small friction area and large shaft) can't see an easy way to fit a bearing without loosing the vintage look. Best I could think of was a bush made from thin wall ptfe tube? Does anyone think this would work or have any other ideas?
Sorry for all the questions J