Does anyone know, or know where to find online, the specs for the pulley that a J-series belt would fit on? I have measured the spacing to be 3/32" but I don't have access to a pulley until tomorrow afternoon and really would like to get one pulley done by that time.

My dilemma is, the client is Amish, it's Sunday evening and I'd rather not make the half-hour drive to his place in the morning to get the belt number which I failed to write down the last time I saw him.

The belt in question is used in the DeWalt crosscut saw which he is adapting a gas motor to. Also for the serpentine belts in auto engines.

Kind of odd that Amish can use their English neighbor's phone but not have their own - and very inconvenient at times!

On 18/07/16 02:46, Ken Grunke wrote:
Does anyone know, or know where to find online, the specs for the pulley that a J-series belt would fit on? I have measured the spacing to be 3/32" but I don't have access to a pulley until tomorrow afternoon and really would like to get one pulley done by that time.

My dilemma is, the client is Amish, it's Sunday evening and I'd rather not make the half-hour drive to his place in the morning to get the belt number which I failed to write down the last time I saw him.

The belt in question is used in the DeWalt crosscut saw which he is adapting a gas motor to. Also for the serpentine belts in auto engines.

Kind of odd that Amish can use their English neighbor's phone but not have their own - and very inconvenient at times!
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf
.. You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.

"David Billington" wrote in message
...
On 18/07/16 02:46, Ken Grunke wrote:

Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf .
You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.

Thanks, I saved that as a German-English technical dictionary. The
translation is almost literally word for word and yet flows decently
in English.

--jsw

On 18/07/16 11:49, Jim Wilkins wrote:
"David Billington" wrote in message
...
On 18/07/16 02:46, Ken Grunke wrote:
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf .
You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.
Thanks, I saved that as a German-English technical dictionary. The
translation is almost literally word for word and yet flows decently
in English.

--jsw


There is a purely English version of that document available but that
was the first version I could find with a quick search.

David Billington fired this volley in news:nmick5$f0g$1
@dont-email.me:

There is a purely English version of that document available but that
was the first version I could find with a quick search.


Despite the fact that his customer is Amish, I seriously doubt if the
document need be in German!

However, since he was asking, and you were answering, mightn't it have been
nice if you'd published the link to what you found?

Lloyd

On 18/07/16 11:57, Lloyd E. Sponenburgh wrote:
David Billington fired this volley in news:nmick5$f0g$1
@dont-email.me:

There is a purely English version of that document available but that
was the first version I could find with a quick search.

Despite the fact that his customer is Amish, I seriously doubt if the
document need be in German!

However, since he was asking, and you were answering, mightn't it have been
nice if you'd published the link to what you found?

Lloyd
See my first reply to the OP where I posted the link to the document.
It's in German and English.

On 18/07/16 11:57, Lloyd E. Sponenburgh wrote:
David Billington fired this volley in news:nmick5$f0g$1
@dont-email.me:

There is a purely English version of that document available but that
was the first version I could find with a quick search.

Despite the fact that his customer is Amish, I seriously doubt if the
document need be in German!

However, since he was asking, and you were answering, mightn't it have been
nice if you'd published the link to what you found?

Lloyd
An English version
http://www.powerparts.it/contitech_p...H_multirib.pdf *

*

"David Billington" wrote in message
...
On 18/07/16 11:49, Jim Wilkins wrote:
"David Billington" wrote in message
...
On 18/07/16 02:46, Ken Grunke wrote:
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf .
You should find the details you need such as spacing, V angle etc
in
the first 12 pages or so.
Thanks, I saved that as a German-English technical dictionary. The
translation is almost literally word for word and yet flows
decently
in English.

--jsw


There is a purely English version of that document available but
that was the first version I could find with a quick search.

I subscribe to the German-language version of this and have trouble
with the numerous technical terms that aren't in my dictionary.
http://media.daimler.com/marsMediaSi...ml?oid=9917073
--jsw

On Monday, July 18, 2016 at 3:54:59 AM UTC-5, David Billington wrote:
On 18/07/16 02:46, Ken Grunke wrote:
Does anyone know, or know where to find online, the specs for the pulley
that a J-series belt would fit on? ...

Kind of odd that Amish can use their English neighbor's phone but not have their own - and very inconvenient at times!
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf
. You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.

Awesome, thank you. I got the groove angle right, 40 deg. but the spacing is 2.34 mm, a little off from my 2.38 mm, the decimal equivalent of 3/32". And that's 1/100th of a millimeter outside the permissable range of error. I'm using the 16 tpi lead screw to space the grooves, with an index pin into a large gear. I wonder if I can continue with that spacing, without problems. The client is happy with it so guess I am too.
Here's a couple shots of what he's doing:
https://i.imgur.com/o44cvan.jpg
https://i.imgur.com/JryOshE.png

On 18/07/16 17:27, Ken Grunke wrote:
On Monday, July 18, 2016 at 3:54:59 AM UTC-5, David Billington wrote:
On 18/07/16 02:46, Ken Grunke wrote:
Does anyone know, or know where to find online, the specs for the pulley
that a J-series belt would fit on? ...

Kind of odd that Amish can use their English neighbor's phone but not have their own - and very inconvenient at times!
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf
. You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.
Awesome, thank you. I got the groove angle right, 40 deg. but the spacing is 2.34 mm, a little off from my 2.38 mm, the decimal equivalent of 3/32". And that's 1/100th of a millimeter outside the permissable range of error. I'm using the 16 tpi lead screw to space the grooves, with an index pin into a large gear. I wonder if I can continue with that spacing, without problems. The client is happy with it so guess I am too.
Here's a couple shots of what he's doing:
https://i.imgur.com/o44cvan.jpg
https://i.imgur.com/JryOshE.png

Looks neat and handy to have so that Amish person has adopted some
modern conveniences but I guess no electricity hence the engine.

I've made one 6 groove J pulley for a motor to drive a flat lap disc.
The disc was mounted onto a VW rear stub axle and drum assembly and the
drum OD was machined as standard so the poly V ran directly on that.
IIRC somewhere in the design guide it mentions if the driven is more
than IIRC 10x the driving pulley diameter you don't need the grooves and
can run the belt on a cylinder and treat it like a flat belt. My lathe
has a DRO so the spacing was easy and I made a single point tool for the
job, worked well.

On 18/07/16 17:27, Ken Grunke wrote:
On Monday, July 18, 2016 at 3:54:59 AM UTC-5, David Billington wrote:
On 18/07/16 02:46, Ken Grunke wrote:
Does anyone know, or know where to find online, the specs for the pulley
that a J-series belt would fit on? ...

Kind of odd that Amish can use their English neighbor's phone but not have their own - and very inconvenient at times!
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf
. You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.
Awesome, thank you. I got the groove angle right, 40 deg. but the spacing is 2.34 mm, a little off from my 2.38 mm, the decimal equivalent of 3/32". And that's 1/100th of a millimeter outside the permissable range of error. I'm using the 16 tpi lead screw to space the grooves, with an index pin into a large gear. I wonder if I can continue with that spacing, without problems. The client is happy with it so guess I am too.
Here's a couple shots of what he's doing:
https://i.imgur.com/o44cvan.jpg
https://i.imgur.com/JryOshE.png

Looking at the specifications for the J at +-0.03mm deviation from the
pitch as you say you're +0.01mm over but that tolerance means that 2
grooves could be 0.06mm off nominal and still be OK. The sum of
deviations is given as +-0.3mm so if you're not using many ribs you may
be fine as you're at 2.38mm, especially if you're not using many ribs
and not loading it near the limit.

On Monday, July 18, 2016 at 11:55:08 AM UTC-5, David Billington wrote:
On 18/07/16 17:27, Ken Grunke wrote:
On Monday, July 18, 2016 at 3:54:59 AM UTC-5, David Billington wrote:
On 18/07/16 02:46, Ken Grunke wrote:
Does anyone know, or know where to find online, the specs for the pulley
that a J-series belt would fit on? ...

Kind of odd that Amish can use their English neighbor's phone but not have their own - and very inconvenient at times!
Continental have a good design guide here
https://www.contitech.de/pages/produ...irib_de_en.pdf
. You should find the details you need such as spacing, V angle etc in
the first 12 pages or so.
Awesome, thank you. I got the groove angle right, 40 deg. but the spacing is 2.34 mm, a little off from my 2.38 mm, the decimal equivalent of 3/32". And that's 1/100th of a millimeter outside the permissable range of error. I'm using the 16 tpi lead screw to space the grooves, with an index pin into a large gear. I wonder if I can continue with that spacing, without problems. The client is happy with it so guess I am too.
Here's a couple shots of what he's doing:
https://i.imgur.com/o44cvan.jpg
https://i.imgur.com/JryOshE.png

Looks neat and handy to have so that Amish person has adopted some
modern conveniences but I guess no electricity hence the engine.

I've made one 6 groove J pulley for a motor to drive a flat lap disc.
The disc was mounted onto a VW rear stub axle and drum assembly and the
drum OD was machined as standard so the poly V ran directly on that.
IIRC somewhere in the design guide it mentions if the driven is more
than IIRC 10x the driving pulley diameter you don't need the grooves and
can run the belt on a cylinder and treat it like a flat belt. My lathe
has a DRO so the spacing was easy and I made a single point tool for the
job, worked well.

I should get me one of dem DRO thingies. The lead screw method was a pain in the ass, mostly due to slop between the half-nut and screw. I messed up 3 blanks of 2" dia. x 1 3/8" long alumninum before I got it right but they can be used somewhere else. Here's my semi-crude indexing setup on my Emco Maier Compact 8:
https://i.imgur.com/EQpS6Kw.jpg

I made sure to turn the leadscrew in one direction only. Then after locking the pin in the gear, I nudged the carriage wheel over to take up any play and locked the carriage for the cut.

I used a single point tool also. Set the compound at 20 deg. so I could cut just the left face of the groove, like a threading tool. One way I messed up the earlier tries was by feeding straight in. I did practice runs on 3/4" shaft first, but got overconfident early (and impatient)

I drilled and tapped 2 setscrews 90 deg. apart so I could mount the blanks on an arbor to get most of the work done.

https://i.imgur.com/lb79eIb.jpg