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Old Apr 11, 2003, 03:01 AM
Richard
Guest
n/a Posts
Miniature reduction drives: Who sells 'em?

Hi. At the moment I'm looking at an epicyclic ball drive with ratio of
10:1 for a project of mine. I am a bit worried about whether the drive
will transmit enough torque. So, does anyone know if I can by a regular
gear reduction drive with about 10:1 reduction? The project involves
1/4" (6.35mm) shafts in and out. Not much torque involved, simply
turning a largish tuning capacitor. Don't know what the torque
requirement could be exactly. Epicyclics made for turning variable
capacitors are good for between 56mNm to 175mN, so gear drive would, I
think, have to transmit 175nMn at least, and preferably some more. That
probably is not difficult with a gear drive. TIA. Rich.

Old Apr 11, 2003, 03:01 AM
Dave Jones
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?

Try RS components they have several small reduction boxes
Dave
"Richard" <nogood@email.com> wrote in message
news:39dla.130$Aq1.63@newsfep4-winn.server.ntli.net...
> Hi. At the moment I'm looking at an epicyclic ball drive with ratio of
> 10:1 for a project of mine. I am a bit worried about whether the drive
> will transmit enough torque. So, does anyone know if I can by a regular
> gear reduction drive with about 10:1 reduction? The project involves
> 1/4" (6.35mm) shafts in and out. Not much torque involved, simply
> turning a largish tuning capacitor. Don't know what the torque
> requirement could be exactly. Epicyclics made for turning variable
> capacitors are good for between 56mNm to 175mN, so gear drive would, I
> think, have to transmit 175nMn at least, and preferably some more. That
> probably is not difficult with a gear drive. TIA. Rich.
>



Old Apr 11, 2003, 03:01 AM
Mark McGrath
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?

"Richard" <nogood@email.com> wrote in message news:<39dla.130$Aq1.63@newsfep4-winn.server.ntli.net>...
> Hi. At the moment I'm looking at an epicyclic ball drive with ratio of
> 10:1 for a project of mine. I am a bit worried about whether the drive
> will transmit enough torque. So, does anyone know if I can by a regular
> gear reduction drive with about 10:1 reduction? The project involves
> 1/4" (6.35mm) shafts in and out. Not much torque involved, simply
> turning a largish tuning capacitor. Don't know what the torque
> requirement could be exactly. Epicyclics made for turning variable
> capacitors are good for between 56mNm to 175mN, so gear drive would, I
> think, have to transmit 175nMn at least, and preferably some more. That
> probably is not difficult with a gear drive. TIA. Rich.


Try Parvalux.Down the south west somewhere.I think they have a website.
Regards,Mark
Old Apr 11, 2003, 03:01 AM
Bob Minchin
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?

Richard wrote:

> Hi. At the moment I'm looking at an epicyclic ball drive with ratio of
> 10:1 for a project of mine. I am a bit worried about whether the drive
> will transmit enough torque. So, does anyone know if I can by a regular
> gear reduction drive with about 10:1 reduction? The project involves
> 1/4" (6.35mm) shafts in and out. Not much torque involved, simply
> turning a largish tuning capacitor. Don't know what the torque
> requirement could be exactly. Epicyclics made for turning variable
> capacitors are good for between 56mNm to 175mN, so gear drive would, I
> think, have to transmit 175nMn at least, and preferably some more. That
> probably is not difficult with a gear drive. TIA. Rich.


Jacksons 3:1 ball drive ones are pretty standard. I've used two in cascade
before now. This would give you 9:1 is this near enough to 10:1 for your
application?
If you are worried about torque, and your capacitor is a standard type the
you could slacken off the rear bearing a touch to reduce the load. you
should not have any end float but minimal drag too. Light grease might help
too.often they use a really thick grease to give a smooth feel which in your
case will be provided by the ball drive(s).

Bob


Old Apr 11, 2003, 03:01 AM
Tim Christian
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?


Bob Minchin <bob.minchin@ntlworld.com> wrote in message
news:3E95CEF8.76C24F15@ntlworld.com...
> Richard wrote:
>
> > Hi. At the moment I'm looking at an epicyclic ball drive with ratio of
> > 10:1 for a project of mine. I am a bit worried about whether the drive
> > will transmit enough torque. So, does anyone know if I can by a regular
> > gear reduction drive with about 10:1 reduction? The project involves
> > 1/4" (6.35mm) shafts in and out. Not much torque involved, simply
> > turning a largish tuning capacitor. Don't know what the torque
> > requirement could be exactly. Epicyclics made for turning variable
> > capacitors are good for between 56mNm to 175mN, so gear drive would, I
> > think, have to transmit 175nMn at least, and preferably some more. That
> > probably is not difficult with a gear drive. TIA. Rich.


Jacksons - now owned by Mainline - make 6:1 and 10:1 ball drives. There are
two 10:1 versions, light and heavy duty. Call them direct on 020 868 33853
(not Fridays).

Tim.


Old Apr 11, 2003, 03:01 AM
Peter A Forbes
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?

On Fri, 11 Apr 2003 06:30:31 +0100, "Tim Christian"
<tim@isoplethics.free-online.co.uk> wrote:

>
>Bob Minchin <bob.minchin@ntlworld.com> wrote in message
>news:3E95CEF8.76C24F15@ntlworld.com...
>> Richard wrote:
>>
>> > Hi. At the moment I'm looking at an epicyclic ball drive with ratio of
>> > 10:1 for a project of mine. I am a bit worried about whether the drive
>> > will transmit enough torque. So, does anyone know if I can by a regular
>> > gear reduction drive with about 10:1 reduction? The project involves
>> > 1/4" (6.35mm) shafts in and out. Not much torque involved, simply
>> > turning a largish tuning capacitor. Don't know what the torque
>> > requirement could be exactly. Epicyclics made for turning variable
>> > capacitors are good for between 56mNm to 175mN, so gear drive would, I
>> > think, have to transmit 175nMn at least, and preferably some more. That
>> > probably is not difficult with a gear drive. TIA. Rich.

>
>Jacksons - now owned by Mainline - make 6:1 and 10:1 ball drives. There are
>two 10:1 versions, light and heavy duty. Call them direct on 020 868 33853
>(not Fridays).
>
>Tim.
>


That's a name from the past, they used to be in Waddon, between Croydon and
Wallington. I remember going there in the 1960's to collect some drives for a
radio I was making... Very nice people if I remember correctly.

Peter (in memory lane mode!)

--
Peter & Rita Forbes
diesel@easynet.co.uk
Engine pages for preservation info:
http://www.oldengine.org/members/diesel
Old Apr 12, 2003, 03:01 AM
Charles Ping
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?

>
You could try Davall Stock Gears on 01707 283131.
Their metric drive components catalogue has the sort of thing that I
think meets your requirements.

Charles


--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
Old Apr 12, 2003, 03:01 AM
steamer
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?

Bob Minchin <bob.minchin@ntlworld.com> wrote:
: Jacksons 3:1 ball drive ones are pretty standard. I've used two in cascade
: before now. This would give you 9:1 is this near enough to 10:1 for your
: application?
(SNIP)
--Got a link to a photo or two? What the heck is a ball drive?


--
"Steamboat Ed" Haas : There's nothing like repression
Hacking the Trailing Edge! : to stimulate the artist...
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---
Old Apr 12, 2003, 03:01 AM
Richard
Guest
n/a Posts
Re: Miniature reduction drives: Who sells 'em?


"steamer" <steamer@sonic.net> wrote in message
news:zCBla.4665$JX2.335982@typhoon.sonic.net...
> Bob Minchin <bob.minchin@ntlworld.com> wrote:
> : Jacksons 3:1 ball drive ones are pretty standard. I've used two in

cascade
> : before now. This would give you 9:1 is this near enough to 10:1 for

your
> : application?
> (SNIP)
> --Got a link to a photo or two? What the heck is a ball drive?
>

http://www.mainlinegroup.co.uk/jacks....htm#catalogue

 


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