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OT: help looking for a part

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3edcft6(at)cox.net
Guest

Posted: Sun Jun 29, 2008 8:56 am Post subject: OT: help looking for a part

Totally non aviation related but if the part I am looking for exists, 

I'm sure someone here knows where to get it.



I have this mechanism (details not important) that is actuated with a 

rope, probably 3/16" parachute cord.  The rope will exit out of a wood 

cabinet through a round hole.  The problem is the pull on the rope will 

be almost at 90 degrees from the axis of the hole causing it to rub on 

the edge of the hole which will make the rope wear out and cause lots of 

friction.  What I am looking for is some kind of metal insert I can put 

in the hole that will have a large inside radius to give the rope a 

smooth surface to ride on.  I know a pulley would be the ideal solution 

but that would make the cabinet unattractive and the force on the rope 

will be less than 20 lbs so I think it should work fine with just some 

kind of bushing in the hole.  The larger the radius the better this 

should work.  I'm hoping to find something made out of either Stainless 

steel or Brass.  I guess a plastic would be ok too but I would rather it 

be metal.



What I had in mind was something with a similar cross section to the 

attached drawing.  I could just have a machine shop put a radius on a 

brass bushing but I would rather not have to do that, and I haven't 

found a bushing with a thick enough wall to get as large of a radius as 

I would like, 1/4" or larger.

do not archive

-- 

Chris W

KE5GIX



"Protect your digital freedom and privacy, eliminate DRM, 

learn more at http://www.defectivebydesign.org/what_is_drm"



Ham Radio Repeater Database.

http://hrrdb.com

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brian.kraut(at)engalt.com
Guest

Posted: Sun Jun 29, 2008 9:36 am Post subject: OT: help looking for a part

How about a cable fairlead from Aircraft Spruce?



http://www.aircraftspruce.com/pdf/2008Individual/Cat08139.pdf



Brian Kraut

Engineering Alternatives, Inc.

www.engalt.com 



--

wmjack1(at)t3cs.net
Guest

Posted: Sun Jun 29, 2008 9:54 am Post subject: OT: help looking for a part

Chris,



Those types of blocks are common in the sailing world and are called turning

blocks. They are typically mounted inside masts, booms or other hardware.  You

might try this piece for starters:

http://discountmarinesource.com/detail.aspx?ID=823



They come in many sizes and rated for small to very large loads and there are

models for standard rope, wire-rope, wire and aramids.



Good luck,

Jack Hilditch

RV-9A project underway



--

Terry Watson

Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA

Posted: Sun Jun 29, 2008 10:33 am Post subject: OT: help looking for a part

Chris,



Sailboat hardware manufacturer's make something called an exit block which

has a pulley in it, or an exit plate that doesn't have the pulley that works

in a situation like you are describing. They probably won't work if you want

to be able to pull the line from any angle since they are directional.



Here's a link to an exit plate by one manufacturer. From the prices for this

stuff, you would think they were for airplanes.

http://www.fawcettboat.com/iwwidb.pvx?;multi_item_submit



Terry



--

rice737(at)msn.com
Guest

Posted: Sun Jun 29, 2008 11:20 am Post subject: OT: help looking for a part

Hey Chris,

  

 Also in the sailing world, they make deck bushings for just such a perpose.  Go on line to search them out.  How big a hole do have in the cabinet.

  

 Paul

 Rv8

  [quote][b]

pitts_pilot(at)bellsouth.
Guest

Posted: Sun Jun 29, 2008 12:29 pm Post subject: OT: help looking for a part

I read all the other replies and while I was thinking of a large brass 

grommet ..... like to put in canvass ..... there are far better 

solutions already.  My question is what the heck does the rope do in the 

cabinet????  Answer quickly .... I want to sleep tonight!!! 

Linn

do not archive

 	  Quote: 	
		   Totally non aviation related but if the part I am looking for exists, 

 I'm sure someone here knows where to get it.



 I have this mechanism (details not important) that is actuated with a 

 rope, probably 3/16" parachute cord.  The rope will exit out of a wood 

 cabinet through a round hole.  The problem is the pull on the rope 

 will be almost at 90 degrees from the axis of the hole causing it to 

 rub on the edge of the hole which will make the rope wear out and 

 cause lots of friction.

snip!

3edcft6(at)cox.net
Guest

Posted: Sun Jun 29, 2008 2:49 pm Post subject: OT: help looking for a part

It is to assist the folding up of a Murphy bed.  The gas springs aren't 

quite enough to balance out the weight of the bed is with the the rope I 

can pull instead of push.  Also the tight fit makes it very hard to get 

at the foot of the bed to push where there is the most leverage. 

So for it looks like the cable fairleads form aircraft Spruce look like 

the best option.  The catalog doesn't say how large the inside hole is 

though.

linn Walters wrote:

 	  Quote: 	

 I read all the other replies and while I was thinking of a large brass 

 grommet ..... like to put in canvass ..... there are far better 

 solutions already.  My question is what the heck does the rope do in 

 the cabinet????  Answer quickly .... I want to sleep tonight!!! 

 Linn

 do not archive

> Totally non aviation related but if the part I am looking for exists, 

> I'm sure someone here knows where to get it.

>

> I have this mechanism (details not important) that is actuated with a 

> rope, probably 3/16" parachute cord.  The rope will exit out of a 

> wood cabinet through a round hole.  The problem is the pull on the 

> rope will be almost at 90 degrees from the axis of the hole causing 

> it to rub on the edge of the hole which will make the rope wear out 

> and cause lots of friction.

 snip!

-- 

Chris W

KE5GIX

"Protect your digital freedom and privacy, eliminate DRM, 

learn more at http://www.defectivebydesign.org/what_is_drm"

Ham Radio Repeater Database.

http://hrrdb.com

truflite(at)yahoo.com
Guest

Posted: Mon Jun 30, 2008 1:07 am Post subject: OT: help looking for a part

I have a lathe in my basement as well as a mill.  Send me exact dimensions on a drawing and I can turn that out for you for the cost of shipping.  I have lots of scrap aluminum rod that I can use.



Dave Nellis

davidnellis691(at)comcast.net

truflite(at)yahoo.com

--- On Sun, 6/29/08, Chris W <3edcft6(at)cox.net> wrote:



 	  Quote: 	
		   From: Chris W <3edcft6(at)cox.net>

 Subject: OT: help looking for a part

 To: "RV-list" <rv-list(at)matronics.com>

 Date: Sunday, June 29, 2008, 12:53 PM

 Totally non aviation related but if the part I am looking

 for exists, 

 I'm sure someone here knows where to get it.

 

 I have this mechanism (details not important) that is

 actuated with a 

 rope, probably 3/16" parachute cord.  The rope will

 exit out of a wood 

 cabinet through a round hole.  The problem is the pull on

 the rope will 

 be almost at 90 degrees from the axis of the hole causing

 it to rub on 

 the edge of the hole which will make the rope wear out and

 cause lots of 

 friction.  What I am looking for is some kind of metal

 insert I can put 

 in the hole that will have a large inside radius to give

 the rope a 

 smooth surface to ride on.  I know a pulley would be the

 ideal solution 

 but that would make the cabinet unattractive and the force

 on the rope 

 will be less than 20 lbs so I think it should work fine

 with just some 

 kind of bushing in the hole.  The larger the radius the

 better this 

 should work.  I'm hoping to find something made out of

 either Stainless 

 steel or Brass.  I guess a plastic would be ok too but I

 would rather it 

 be metal.

 

 What I had in mind was something with a similar cross

 section to the 

 attached drawing.  I could just have a machine shop put a

 radius on a 

 brass bushing but I would rather not have to do that, and I

 haven't 

 found a bushing with a thick enough wall to get as large of

 a radius as 

 I would like, 1/4" or larger.

 

 

 do not archive

 

 

 -- 

 Chris W

 KE5GIX

 

 "Protect your digital freedom and privacy, eliminate

 DRM, 

 learn more at

 http://www.defectivebydesign.org/what_is_drm"

 

 Ham Radio Repeater Database.

 http://hrrdb.com

bmeyette

Joined: 14 Mar 2007
Posts: 72
Location: Cornish, NH

Posted: Mon Jun 30, 2008 6:50 am Post subject: OT: help looking for a part

As you titled the email, it's just a bushing that anyone with a lathe can

easily make for you in a few minutes



--

_________________
Brian Meyette, Cornish, NH

RV-7A QB tipup, supercharged Subaru STi engine, MT CS prop, all glass day/night/IFR panel, being built with solar and wind power

N432MM

http://brian76.mystarband.net/RV-7Ahome.htm

bmeyette

Joined: 14 Mar 2007
Posts: 72
Location: Cornish, NH

Posted: Mon Jun 30, 2008 6:53 am Post subject: OT: help looking for a part

I meant to say "as you titled the picture" - an di see someone else has

offered to turn one out for you - should be quick & easy, based on your pic

brian



--

rocketbob(at)gmail.com
Guest

Posted: Mon Jun 30, 2008 7:10 am Post subject: OT: help looking for a part

If you have a quick change tool post on your lathe and a holder with a drill chuck, you can use a corner rounding end mil to make the radius.  Would take maybe five minutes to setup and cut.



Regards,

Bob Japundza

 RV-6 flying F1 under const.



On Mon, Jun 30, 2008 at 10:44 AM, Brian Meyette <bmeyette(at)gmail.com (bmeyette(at)gmail.com)> wrote:

[quote] --> RV-List message posted by: "Brian Meyette" <bmeyette(at)gmail.com (bmeyette(at)gmail.com)>

 

 As you titled the email, it's just a bushing that anyone with a lathe can

 easily make for you in a few minutes

 

 

 

 --

jconnell(at)fmwildblue.co
Guest

Posted: Mon Jun 30, 2008 10:24 am Post subject: OT: help looking for a part

You might consider using an aluminum flange for  ducting.  The smallest size hole

 is 1".  Just a thought...

  

 http://www.aircraftspruce.com/catalog/appages/ductflanges.php

  

 Joe

 



Time: 09:56:50 AM PST US

From: Chris W <3edcft6(at)cox.net (3edcft6(at)cox.net)>

Subject: OT:  help looking for a part



Totally non aviation related but if the part I am  looking for exists, 

I'm sure someone here knows where to get it.



I  have this mechanism (details not important) that is actuated with a 

rope,  probably 3/16" parachute cord.  The rope will exit out of a wood  

cabinet through a round hole.  The problem is the pull on the rope will  

be almost at 90 degrees from the axis of the hole causing it to rub on  

the edge of the hole which will make the rope wear out and cause lots of  

friction.  What I am looking for is some kind of metal insert I can put  

in the hole that will have a large inside radius to give the rope a  

smooth surface to ride on.  I know a pulley would be the ideal solution  

but that would make the cabinet unattractive and the force on the rope  

will be less than 20 lbs so I think it should work fine with just some  

kind of bushing in the hole.  The larger the radius the better this  

should work.  I'm hoping to find something made out of either Stainless  

steel or Brass.  I guess a plastic would be ok too but I would rather  it 

be metal.



What I had in mind was something with a similar cross  section to the 

attached drawing.  I could just have a machine shop put  a radius on a 

brass bushing but I would rather not have to do that, and I  haven't 

found a bushing with a thick enough wall to get as large of a radius  as 

I would like, 1/4" or larger.

do not archive

--  

Chris W

KE5GIX



"Protect your digital freedom and privacy,  eliminate DRM, 

learn more at http://www.defectivebydesign.org/what_is_drm"



Ham  Radio Repeater Database.

http://hrrdb.com

   [quote][b]

bobbyhester(at)newwavecom
Guest

Posted: Mon Jun 30, 2008 2:41 pm Post subject: OT: help looking for a part

Here is a link for the parts from Wicks and they list the sizes that ACS 

did not:

http://www.wicksaircraft.com/catalog/product_cat.php/subid=520/index.html



Chris W wrote:

 	  Quote: 	
		   



 It is to assist the folding up of a Murphy bed.  The gas springs 

 aren't quite enough to balance out the weight of the bed is with the 

 the rope I can pull instead of push.  Also the tight fit makes it very 

 hard to get at the foot of the bed to push where there is the most 

 leverage.

 So for it looks like the cable fairleads form aircraft Spruce look 

 like the best option.  The catalog doesn't say how large the inside 

 hole is though.



 linn Walters wrote:

> 

>

> I read all the other replies and while I was thinking of a large 

> brass grommet ..... like to put in canvass ..... there are far better 

> solutions already.  My question is what the heck does the rope do in 

> the cabinet????  Answer quickly .... I want to sleep tonight!!! 

> Linn

> do not archive

>> Totally non aviation related but if the part I am looking for 

>> exists, I'm sure someone here knows where to get it.

>>

>> I have this mechanism (details not important) that is actuated with 

>> a rope, probably 3/16" parachute cord.  The rope will exit out of a 

>> wood cabinet through a round hole.  The problem is the pull on the 

>> rope will be almost at 90 degrees from the axis of the hole causing 

>> it to rub on the edge of the hole which will make the rope wear out 

>> and cause lots of friction.

> snip!

>

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