Re: Mark V Speed Control
Posted: Mon Nov 14, 2022 11:32 am
What are you using to measure a rubber belt width to .0001"?
[/quote]
An inexpensive Husky caliper.
[/quote]
An inexpensive Husky caliper.
So did it get fatter?
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Mark V Speed Control
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Re: Mark V Speed Control
Posted: Mon Nov 14, 2022 9:02 pm
BS resolution
So did it get fatter?
So did it get fatter?
Re: Mark V Speed Control
Posted: Tue Feb 07, 2023 8:17 pm
I am getting a bit confused as I am seeing references to a couple of different numbers for drive belts. I have a SS 48222 December 1979 model 500 and need a new drive belt from the motor to idler shaft. I have a reference of the original v belt number of 504193 but doing a search for that belt it comes up to 521682.
Am I correct in assuming that 504193 was replaced with 521682 and 521682 is the correct number for the replacement belt?
Am I correct in assuming that 504193 was replaced with 521682 and 521682 is the correct number for the replacement belt?
Re: Mark V Speed Control
Posted: Tue Feb 07, 2023 8:35 pm
Yes, 521682 is the current part number for lower drive belt for conventional (non-PowerPro) headstocks.number3456 wrote: ↑Tue Feb 07, 2023 8:17 pm Am I correct in assuming that 504193 was replaced with 521682 and 521682 is the correct number for the replacement belt?
- David
Re: Mark V Speed Control
Posted: Tue Feb 07, 2023 9:41 pm
Thanks!
Re: Mark V Speed Control
Posted: Tue Feb 07, 2023 9:51 pm
So WHY has the pn CHANGED??
Re: Mark V Speed Control
Posted: Tue Feb 07, 2023 10:50 pm
Different supplier? Slightly different profile? Or...
Different specs?
Why change at this late date?
Different specs?
Why change at this late date?
Re: Mark V Speed Control
Posted: Wed Feb 08, 2023 2:29 pm
A search for the 'new' PN here on the forum dates the change back at least as far as 2008. I have a 2002 manual here that reflects the 'old' PN, and a 2004 headstock with the 'old' PN belt in it. The most enlightening thread was: viewtopic.php?p=21073#p21073 (circa 2008). It appears to me that the early 521682 belt was a Gates 2260 (4L260), 26" long and 1/2" nominal width (less than 1/2" in practice). A standard commercial belt, which conventional wisdom on the forum confirms is no good for Marks. I understand that SS has gone back to a custom size belt, exact dimensions sometimes debated, but the 521682 PN remains. My overall impression is that the PN change introduced a shorter narrower commercial belt that was later eliminated without another PN change, perhaps through drawing revisions.
Note: I have no personal experience with a 521682 belt. I have several 504193s. One thing they have in common is they are marked with the SS PN suggesting they are custom built-to-spec parts, made by more than one supplier.
- David
Note: I have no personal experience with a 521682 belt. I have several 504193s. One thing they have in common is they are marked with the SS PN suggesting they are custom built-to-spec parts, made by more than one supplier.
- David
Re: Mark V Speed Control
Posted: Fri Feb 10, 2023 11:23 pm
I noticed the current sale ad lists the PN 504193 Belt on sale for $8.85, regularly $17.69. Clicking the PN link takes you to the 'new' PN, 521682, for $19.99. Clicking Add to Cart from the sale ad puts 521682 in your cart for $19.99. This seems wrong on several levels.
- David
- David