gem update for mr power tools !!

[mac1012]

by jove I think the penny has just dropped decided to take the pulley of and was scratching my head how the the hell it works , I was an engineer machinist ahem 30 years ago and the oily bit in my brain suddenly came alive !

I tought that shaft must come out of the pulley so I put the nut on and gave it a ht with a persuader put the nut on to hit that so as not to damage the threads ( see I told you the oily bit in me came alive )

and out it came ! revealing the correct shaft with shoulder !

then the penny dropped .... the pulley should spin on this shaft ! well it certainly wasn't it was wedged in tight so the whole shaft was turning with the pulley thus turning the nut which should be stationary so everything was just turning and binding on the legs , no wonder it wouldnt go very well !!

this bush in the pic below was inbetween the legs so I assume that is correct as this allows the nut to tighten against the frame and the other end of bush presses against the other leg and the shoulder on other side ? if you don't have the bush the nut has nothing to tighten against and will squash the leg

this is pulley with very rusty hole and has a tiny hole where you should put a few drops of oil to keep the shaft lubed up (behave)

power tool this is the v shaped cup on the top

now where is my 3 in 1 oil ??

 

[powertools]

That looks like the right shaft.
What I have been calling a bolt is what you have got but mine has got a cap and not a bolt head fitted on the end of the shaft to stop the pulley coming off.
The bush between the legs is the same as mine.
Looks as if I have a v shape seat missing
Thanks for that.

 

[mac1012]

lubed it up and put back together a lot better wheel still wobbling a bit still not sure if I got right but at least shaft not going round ! one question is how do you know you got correct tightening on nut as pulley is still rotating against frame so how do you ensure it not catching frame leg am I missing something ??

 

[martinka]

Mark, the pulley would originally have run at the side of the leg, but low speed and some lubrication means it would last a long time. However, it sounds like the hole in the leg may have been widened due to the bolt spinning, allowing the bolt to pull into it. Try putting a washer, same size as the smaller diameter, between the pulley and the leg.
What happened to the bolt head?

Martin.

 

[powertools]

The bolt is not really a bolt but is a stud with one of those caps that you find on the axles of toys to stop the wheel falling off.

 

[martinka]

So there might be some leeway with that cap? You might be able to move it out a bit to give the pulley a bit more room. I'd be tempted to use a washer between the pulley and the leg anyway so that any wear, if there is any, is on the washer rather than on the leg. Looks like it's going to be a good working machine whatever you decide with it. Hopefully.

 

[mac1012]

thanks for reply guys yes mine just has a domed cap on the end i will have a bit more time after today as am off for a week :lol:

the nut on the other end wants freeing up as at the moment i cant turn it much wthout gripping the domed cap really hard at the moment there is too much space so the wheel is wobbling too much , so when the pulley is at the top of stroke it is at an angle and jams a bit

i guess its making sure its tight enough but not too tight

martin i will try the washer there is a good bit of play on the leg holes

mark

 

[mac1012]

just had a quick look and realised the shoulder is a bigger width than the pulley width so that means i can tighten fully the nut onto the bush and frame legs and the space is a bout 3 or 4mm on the shoulder to allow the the pulley not to bind on the leg as i said the shaft is loose at moment and wobbling in the holes in legs i just need to free the nut so i can get some purchase on it to tighten fully

mark

 

[richard56]

by jove I think the penny has just dropped decided to take the pulley of and was scratching my head how the the hell it works , I was an engineer machinist ahem 30 years ago and the oily bit in my brain suddenly came alive !

I tought that shaft must come out of the pulley so I put the nut on and gave it a ht with a persuader put the nut on to hit that so as not to damage the threads ( see I told you the oily bit in me came alive )

and out it came ! revealing the correct shaft with shoulder !


then the penny dropped .... the pulley should spin on this shaft ! well it certainly wasn't it was wedged in tight so the whole shaft was turning with the pulley thus turning the nut which should be stationary so everything was just turning and binding on the legs , no wonder it wouldnt go very well !!

this bush in the pic below was inbetween the legs so I assume that is correct as this allows the nut to tighten against the frame and the other end of bush presses against the other leg and the shoulder on other side ? if you don't have the bush the nut has nothing to tighten against and will squash the leg


this is pulley with very rusty hole and has a tiny hole where you should put a few drops of oil to keep the shaft lubed up (behave)


power tool this is the v shaped cup on the top

now where is my 3 in 1 oil ??

I've added my thanks for this information.
The wheel on my Gem spins too now