4 inch pulley anyone?

[fysty-1]

Here is the pulley drawing as best as I can construct it from what Angela provided and the info I can find on-line. Dan, please review it and challenge away - paper changes cost nothing, changing steel is expensive so the time to catch mistakes is NOW.

Great job Andy. Goes to show why you get the big bucks. :smilie_happy: :yahoo: :yahoo: :yahoo:

 

[MagnAndy]

:thanks: :smilie_happy:

 

[dan filipi]

Andy, I'm going to pull the pulley off mine this weekend and compare.

If anyone else has any thoughts jump right in here.

 

[MagnAndy]

One thought I had was that if we could find a stock pulley with the right diameter and the "K" profile ribs then making the stem portion as an adapter may be a lot cheaper. If anybody has access to a tame Auto-Parts Manager they might find us a common pulley at a reasonable price.

 

[dan filipi]

One thought I had was that if we could find a stock pulley with the right diameter and the "K" profile ribs then making the stem portion as an adapter may be a lot cheaper. If anybody has access to a tame Auto-Parts Manager they might find us a common pulley at a reasonable price.

An off the shelf pulley at around 4 inch diameter has been a problem finding.
Randall posted a link at ngw to a pulley supplier ill have a look at.

 

[dan filipi]

I had a look, $72 for a 3.7" 4 groove.

 

[badorderbob]

Andy, first I like that idea, cost effective!!! Could you use a different size pulley for those who want, maybe a 3 1/2 pulley for instance or even go to a V-belt if they wanted to? I like the adaptor idea :music: :Egyptian: !!! :hi: Later :hi: Bob Ps Andy, like the tutorials and the bottom of your posts :good: !! I'm going to use the leather grip wrap around idea, since I can only use foam grips having Uncle Arther hands :smilie_happy: :wave: !!!

 

[MagnAndy]

Dan,

That price for a production item makes me think that my guy under-estimated what was involved - of course all he had was the previously posted sketch. I'll ask him to re-estimate based on the drawing (some minor changes that we may make over the next week or so won't affect the $$$). I am also going to send it outside for quotes.

Bob,

Glad that you enjoyed them. I originally posted them at v4musclebike.com and I have more there.
These were the only ones that could also apply here. I have a couple more in progress currently. :laptop: :whip:
I suggest a bit of double-sided carpet tape - perhaps one wrap near the thumb end of the leather grip covers before lacing up tightly: I have to keep working the covers back onto the foam grips on my Magna. Mind you a Magna needs some hanging onto when you twist the throttle so perhaps the same thing won't happen on a 'Wing. :smilie_happy:

View attachment Pulley 2 Rev 1.pdf

 

[badorderbob]

Update,.....Please I can't sleep!!! :beg: On my research, :laptop: I found some Super Charger Pulley's made from 6061 T-6 aluminum, hard anodized. Would this type of aluminum work? Just wondering??? :hi: Bob

 

[MagnAndy]

Detailled reply readied last night then lost due to computer crash. Coles Notes version: 4 RFQs issued yesterday - time to wait now. Aluminum out, steel in. TTFN - work time, more later.

 

[MagnAndy]

OK a bit more time available to update you. I sent out 4 Requests for Quotes for a quantity of 15 pulleys to 3 suppliers of similar pieces that I use at work. I also asked my Machine Shop Supervisor to requote in-house production. Before you get the wrong impression - I'm just a cog, I don't own the place so any influence I have is persuasive rather than directive. The RFQs were to Rev 2 which I haven't shared yet but the only diff is the steel callout - no biggie.

Time to hurry up and wait, wait, wait while the suppliers do their stuff.

As for the 6061 T-6 Aluminum: I'm not an expert but my thoughts are that although it would work well in the belt contact area and be lighter, the downside of the small key engagement area and the high contact shoulder forces (due to resisting the belt tension) would result in drastically early failures relative to steel. For these reasons accompanied by added costs for both raw material and annodizing - it is a nogo for me. In fact I am considering adding a second keyway (at about 10% extra cost) to allow the pulley to be re-oriented and reused at no extra cost if the first keyway gets worn or damaged.

If there is one amongst the group that owns a machine shop they may want to jump in with a quote or DIY special.

TTFN

 

[fysty-1]

OK a bit more time available to update you. I sent out 4 Requests for Quotes for a quantity of 15 pulleys to 3 suppliers of similar pieces that I use at work. I also asked my Machine Shop Supervisor to requote in-house production. Before you get the wrong impression - I'm just a cog, I don't own the place so any influence I have is persuasive rather than directive. The RFQs were to Rev 2 which I haven't shared yet but the only diff is the steel callout - no biggie.

Time to hurry up and wait, wait, wait while the suppliers do their stuff.

As for the 6061 T-6 Aluminum: I'm not an expert but my thoughts are that although it would work well in the belt contact area and be lighter, the downside of the small key engagement area and the high contact shoulder forces (due to resisting the belt tension) would result in drastically early failures relative to steel. For these reasons accompanied by added costs for both raw material and annodizing - it is a nogo for me. In fact I am considering adding a second keyway (at about 10% extra cost) to allow the pulley to be re-oriented and reused at no extra cost if the first keyway gets worn or damaged.

If there is one amongst the group that owns a machine shop they may want to jump in with a quote or DIY special.

TTFN

Andy, it has pretty much decide that it will be steel all the way. Thanks a bunch for the update. Angela

 

[dan filipi]

Thanks for the update and your time on this, it's much appreciated.

 

[MagnAndy]

OK - it is good news and bad news - Good News: I have one quote in and they will do it, Bad News:$200/unit. More Bad News: the supplier that I know does 100% perfect work declined to quote based on technical reasons. Good news: still waiting to hear from 2 others - including in-house. I suspect that the tight tolerances on the K section profile are the cause of the high costs. Those tolerances came from Ford-Chrsler-GM with warranty issues in mind. I suspect that if we relax them and accept that more frequent belt changes MAY be required as a result - we can cut the costs. This kind of horse trading might be better done in-house than with a 3rd party. In that case, my recomendation will to be go in-house - but you guys are paying so you get the choice.

 

[jerryinmich57]

OK - it is good news and bad news - Good News: I have one quote in and they will do it, Bad News:$200/unit. More Bad News: the supplier that I know does 100% perfect work declined to quote based on technical reasons. Good news: still waiting to hear from 2 others - including in-house. I suspect that the tight tolerances on the K section profile are the cause of the high costs. Those tolerances came from Ford-Chrsler-GM with warranty issues in mind. I suspect that if we relax them and accept that more frequent belt changes MAY be required as a result - we can cut the costs. This kind of horse trading might be better done in-house than with a 3rd party. In that case, my recomendation will to be go in-house - but you guys are paying so you get the choice.

I just came accross this post and looked at the pdf print if you are talking about the cost being high because of the grooves for the pulley (k section profile?) Have your people look at a iscar gpv insert you can google "iscar gpv insert".
I understand they are used for cutting the grooves for this with the radius and depth built in. That is what I think I would try at the shop if I needed to make that pulley.
I did not read all the posts in this thread so if I am out of line here let me know and I am sorry.
Jerry

 

[MagnAndy]

Thanks Jerry, I did know that there was a profiled insert (it has to be purchased) but have no idea what it was. I will pass this clue along and see what drops out. Again, thanks.

 

[countryboy843]

im kinda late getting in here but i work in a cnc machine shop . i am going to be making a stainless steel pully for my bike next week and i will see what the cost would be to make several steel ones , i doubt it would be more than 50.00 plus shipping . i will post a price next week if yall are interested

 

[dan filipi]

im kinda late getting in here but i work in a cnc machine shop . i am going to be making a stainless steel pully for my bike next week and i will see what the cost would be to make several steel ones , i doubt it would be more than 50.00 plus shipping . i will post a price next week if yall are interested

Yes we're definitely interested!

 

[MagnAndy]

Dan, did you confirm the dimensions against your pulley?

If Countryboy can make them at $50 jump on it - that is less than 1/2 the best price that I have so far (before taxes and shipping too). I may even order one to have just in case.

 

[fysty-1]

Yeh I have to agree as well. I was so disappointed with the results of my call out. I thought there would be more interest.