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 CAD / LDraw Files / Parts / 4988
     
   
Subject: 
Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Wed, 31 Dec 2003 01:31:11 GMT
Viewed: 
3985 times
  

This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309" which is approximately 19.77LDU. Why
are several of these liftarms getting changed to 18LDU?


Paul

   
         
     
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Wed, 31 Dec 2003 01:52:28 GMT
Viewed: 
3997 times
  

In lugnet.cad.dat.parts, Paul Easter wrote:
This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309" which is approximately 19.77LDU. Why
are several of these liftarms getting changed to 18LDU?

Yes that seems strange, as far as I can tell all these liftarms are the same
width as a 1xN brick, so should be modelled as 20LDU as the bricks are.

ROSCO

   
         
     
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Thu, 1 Jan 2004 01:07:28 GMT
Viewed: 
4171 times
  

In lugnet.cad.dat.parts, Paul Easter wrote:
This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309" which is approximately 19.77LDU. Why
are several of these liftarms getting changed to 18LDU?


Paul

I've measured these and several others have as well and we all got 18 LDU

-Orion

    
          
     
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Thu, 1 Jan 2004 08:34:04 GMT
Viewed: 
4406 times
  

In lugnet.cad.dat.parts, Orion Pobursky wrote:
In lugnet.cad.dat.parts, Paul Easter wrote:
This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309" which is approximately 19.77LDU. Why
are several of these liftarms getting changed to 18LDU?


Paul

I've measured these and several others have as well and we all got 18 LDU

-Orion

What are you using to measure with?

I use a dial caliper.

Paul

    
          
     
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Thu, 1 Jan 2004 09:01:27 GMT
Viewed: 
4429 times
  

Paul Easter wrote:
In lugnet.cad.dat.parts, Orion Pobursky wrote:
In lugnet.cad.dat.parts, Paul Easter wrote:
This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309" which is approximately
19.77LDU. Why are several of these liftarms getting changed to
18LDU?


Paul

I've measured these and several others have as well and we all got
18 LDU

-Orion

What are you using to measure with?

I use a dial caliper.

Paul

I confirm Pauls measurement. I compared it with a brick and it has
the same thickness. This is also needed to connect a pin with the holes.

CU Bernd

   
         
   
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Thu, 1 Jan 2004 16:41:19 GMT
Viewed: 
4284 times
  

In lugnet.cad.dat.parts, Paul Easter wrote:
   This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309” which is approximately 19.77LDU. Why • are several of these liftarms getting changed to 18LDU?


Paul

Liftarms are narrower than bricks, you don’t even need a caliper to see it :



...and measured with a caliper :
  • brick width: 7.8mm
  • liftarm width: 7.4mm
  • liftarm height: 7.8mm
As stud space = 8mm = 20ldu, we get liftarm width = 7.4/8*20 = 18.5ldu, approximated to 18 ldu.

Of course, thick liftarm height remain 20 ldu.

Philo

   
         
   
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Thu, 1 Jan 2004 20:32:05 GMT
Viewed: 
4765 times
  

In lugnet.cad.dat.parts, Philippe Hurbain wrote:
   In lugnet.cad.dat.parts, Paul Easter wrote:
   This part is on the Part Tracker;

http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/32278.dat

The 32278 I have has a thickness of .0309” which is approximately 19.77LDU. Why are several of these liftarms getting changed to 18LDU?


Paul

Liftarms are narrower than bricks, you don’t even need a caliper to see it :



...and measured with a caliper :
  • brick width: 7.8mm
  • liftarm width: 7.4mm
  • liftarm height: 7.8mm
As stud space = 8mm = 20ldu, we get liftarm width = 7.4/8*20 = 18.5ldu, approximated to 18 ldu.

Of course, thick liftarm height remain 20 ldu.

Philo

Thank you for this illustration. I see your point.

These parts should have been originally modeled rotated 90 degrees around Z so that the liftarm “thickness” would have been the same a brick “width”.

I think I can safely say that I have rearely ever used liftarms in the manner you illustrated.

Paul

   
         
   
Subject: 
Re: Why is the Thickness of Liftarms changing?
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Fri, 2 Jan 2004 19:19:03 GMT
Viewed: 
4716 times
  

  
Thank you for this illustration. I see your point.

These parts should have been originally modeled rotated 90 degrees around Z so that the liftarm “thickness” would have been the same a brick “width”.

Indeed but... too late now :-(
  
I think I can safely say that I have rearely ever used liftarms in the manner you illustrated.

...but using plates on side of liftarms can be very helpful to stiffen chassis built with them.

Philo

 

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