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Old 11th May 2006, 05:27 AM   #171
john2 is offline john2  United Kingdom
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Could I order (1) motor & ()
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Old 11th May 2006, 05:43 AM   #172
GAgola is offline GAgola  Kenya
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Default Re: Re: Payment alternatives?...

Quote:
Originally posted by superhkm


You can always do a bank transfer to my account for the motor ( did you want a motor ? ) but the fee will probably be around $50, is in Norway anyways.
Are you mobile in Nairobi ? I might have a personal contact for you, to save you the fees. I'll check if its possible from my side.

No prob with bank transfers, I'm almost certain it will cost more in Nairobi. Yes indeed I do want the motor, and I am mobile in Nairobi, your contact can get to me on 0733-794462. Let me know how it goes....
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Old 11th May 2006, 05:44 AM   #173
john2 is offline john2  United Kingdom
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Could I order 1 motor & 1 pulley please? Its (they) are for LP12-should the pulley dimensions come into question.

Regarding concentricity problem- the best way around this issue it to ream/grind the pulleys bore to close tolerances/high finish (important) - at this point concentricity is a secondary issue. Then mount the machined pulley on a, very tight tolerance mandrel. Place the said mandrel between centres, clock the mandrel up, and then machine the pulley off the mandrel. However, maybe the cost of the mandrel is to a limiting factor.
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Old 11th May 2006, 02:28 PM   #174
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Default Just a general warning

Guys...(and girls if there are)

It is better not publish your paypal address (or email address) anywhere on the internet.

if you have to do it like this..

john dot doe -at- domain dot com


There are robots on the internet that filter pages on the internet and send stuff that look like email addresses to their evil masters.

Thought I'd post this because I just got a mail from someone in this groupbuy who received a phising email

http://en.wikipedia.org/wiki/Phising
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Old 11th May 2006, 05:27 PM   #175
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Quote:
Originally posted by john2
Could I order 1 motor & 1 pulley please? Its (they) are for LP12-should the pulley dimensions come into question.

Regarding concentricity problem- the best way around this issue it to ream/grind the pulleys bore to close tolerances/high finish (important) - at this point concentricity is a secondary issue. Then mount the machined pulley on a, very tight tolerance mandrel. Place the said mandrel between centres, clock the mandrel up, and then machine the pulley off the mandrel. However, maybe the cost of the mandrel is to a limiting factor.
Hi John, great process if you're machining something with a larger bore but not necessary for this pulley. We used expanding mandrels everyday when I worked on the Alaskan pipeline pump project back in the 1970's.
I have no problem with concentricity requirements using standard fundamental machining techniques. I think the problem a lot of garage machininsts run into is in thinking that simply reaming a close tolerance hole controls concentricity as well, not so.
For anyone wishing to build their own pulley for the Maxon motor discussed for this project, visit Maxon's website. They have documented all dimensions and tolerances there.
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Old 11th May 2006, 09:03 PM   #176
JRags is offline JRags  United States
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Default Pulley GroupBuy

Are we still moving toward a groupbuy on a pulley? Earlier, I had suggested 11 mm which is what Origin Live is using on their motors. Mark's well reasoned reply indicates this size is too small for platter driven turntables using the 110191 motor.

A few threads back someone suggested a range of 15-20 mm, with 17 mm maybe best. Either will work for me as long as the crown is not to high or too much wider. My subplatter is 208 mm. So 17 mm gives 407.8 rpm at 33 and 550.6 rpm at 45.

Is there any consensus on a course of action?
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Old 11th May 2006, 09:22 PM   #177
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Default Re: Pulley GroupBuy

Quote:
Originally posted by JRags
Are we still moving toward a groupbuy on a pulley? Earlier, I had suggested 11 mm which is what Origin Live is using on their motors. Mark's well reasoned reply indicates this size is too small for platter driven turntables using the 110191 motor.

A few threads back someone suggested a range of 15-20 mm, with 17 mm maybe best. Either will work for me as long as the crown is not to high or too much wider. My subplatter is 208 mm. So 17 mm gives 407.8 rpm at 33 and 550.6 rpm at 45.

Is there any consensus on a course of action?
I mentioned to Mark that I would be willing to make the pulleys but I think we are looking at a few issues here.

#1- There have been a few opinions on what size their specific pulley should be. Is it possible for everyone to agree on a "one size fits all" approach? Probably not since different platter diameters will mean different pulley diameters.

#2- What profile will the pulley be? Crowned, flat, tapered?
Any preference?

#3- What type of mounting scheme do you want to use? The pulley design can vary depending on this variable. I used a 1/4" thick mounting plate FWIW.

The group needs to figure out and agree on these 3 issues in order to proceed. It's possible to build "one offs" for everyone but the cost goes way up if that happens. I'm sure you can find someone willing to do the job for the group if you can solve these issues but it will be harder and more expensive to find a shop to machine several different designs.
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Old 11th May 2006, 09:27 PM   #178
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I for one am wide open on the pulley design as my table does not exist yet and I can design around what everyone else decides upon.

Mark
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Old 11th May 2006, 10:25 PM   #179
JRags is offline JRags  United States
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Default Pulley GroupBuy

Quote:
I mentioned to Mark that I would be willing to make the pulleys but I think we are looking at a few issues here.
I vote one size fits all. We then can see how many members will sign up for the pulley. This was essentially the approach that was taken on the motor.

I suggest we go with a bronze, crowned pulley with a diameter Vinyl-Addict and Mark agree on. The quarter mounting plate could be optional but the pulley design would accommodate it. Then see how many members sign-up. If the number is sufficient to make it worthwhile for Vinyl-Addict, or some other machinist someone knows, then its a go. If not then we are on our own.

My two cents.
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Old 11th May 2006, 10:26 PM   #180
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Default Pulleys

I second that motion
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