Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > The Doctor is In! > Ask the Doctor
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 11-03-2010, 10:08 AM
Grimracer's Avatar
Grimracer Grimracer is offline
Intermediate Rocketeer
 
Join Date: Feb 2010
Posts: 69
Default 29mm case dia

I need somebody to place a caliper on a 29mm reload case (not the consumer case). I need this in .002 or so precision. (standard or metric units are fine)

Thanks in advance!

Grimracer
Reply With Quote
  #2  
Old 11-03-2010, 10:20 AM
Shreadvector's Avatar
Shreadvector Shreadvector is offline
Launching since 1970.
 
Join Date: Mar 2005
Location: Southern California
Posts: 2,188
Default

Every case will vary, but they should vary within the tolerance range shown on the Engineering Drawings:


http://www.aerotech-rocketry.com/resources.aspx?id=7


The dimension shown is a 3-place dimension of 1.125 inches and the tolerance shown for a 3 place dimension on the drawings is +/- .005 inches.

A telephone call or e-mail to Aerotech will confirm if this is indeed correct.

Of course, this is the diameter measured at any point along the length. There may be other tolerance for the waviness of the tube over a certain length.

No idea what version of ANSI Y14.5M is used (if any).

http://en.wikipedia.org/wiki/Geomet...and_tolerancing
Aren't you glad you asked?
__________________
-Fred Shecter NAR 20117 (L2)
Southern California Rocket Association, NAR Section 430
Reply With Quote
  #3  
Old 11-03-2010, 11:04 AM
Grimracer's Avatar
Grimracer Grimracer is offline
Intermediate Rocketeer
 
Join Date: Feb 2010
Posts: 69
Default

Thanks.. that got it..

Baced on the drawing from the link...

1.125"+.010" is what I will make it then.. give my self .005"!

Thanks allot!

Grim
Reply With Quote
  #4  
Old 11-03-2010, 07:39 PM
Grimracer's Avatar
Grimracer Grimracer is offline
Intermediate Rocketeer
 
Join Date: Feb 2010
Posts: 69
Default

And the reasion for the question.. thanks again

Grimracer
Attached Thumbnails
Click image for larger version

Name:  Corvette 1.jpg
Views: 107
Size:  168.8 KB  
Reply With Quote
  #5  
Old 11-04-2010, 12:23 PM
Initiator001 Initiator001 is offline
Too Many Initiators is Never Enough
 
Join Date: Mar 2005
Location: San Diego, CA
Posts: 2,394
Default

Quote:
Originally Posted by Grimracer
And the reasion for the question.. thanks again

Grimracer


Nice paint job.

Your post on TRF states the model is a NCR by Estes Eliminator. Those kits used a motor mount tube which had an inside diameter smaller than 29mm so that only the NCRBE F62 DarkStar motors (28.5mm diameter) would fit.

I replaced these motor mount tubes in my NCRBE kits with 'true' 29mm I.D. tubing.

Have a good flight!

Bob
Reply With Quote
  #6  
Old 11-04-2010, 01:56 PM
Grimracer's Avatar
Grimracer Grimracer is offline
Intermediate Rocketeer
 
Join Date: Feb 2010
Posts: 69
Default

Right you are Bob..

What I did was laser cut a mandrel and put in some 60g sand paper.. Sanding flapper wheel if you will.. I also made a sizing slug sized to 1.235"(because I don’t have my 29mm case yet). (other then my consumer case)

As is goes the hand made flapper wheel really hogs material and it only took about 2 mins to get it sized.

Thanks

Grimracer


let me show you my rearend.. so to speek
Attached Thumbnails
Click image for larger version

Name:  IMG_0019.jpg
Views: 85
Size:  459.8 KB  
Reply With Quote
  #7  
Old 11-09-2010, 08:23 AM
Grimracer's Avatar
Grimracer Grimracer is offline
Intermediate Rocketeer
 
Join Date: Feb 2010
Posts: 69
Default

Reply With Quote
  #8  
Old 11-09-2010, 09:29 AM
Shreadvector's Avatar
Shreadvector Shreadvector is offline
Launching since 1970.
 
Join Date: Mar 2005
Location: Southern California
Posts: 2,188
Thumbs up

Spectacularly shiny finish visible in the video and insanely straight flight.
__________________
-Fred Shecter NAR 20117 (L2)
Southern California Rocket Association, NAR Section 430
Reply With Quote
  #9  
Old 11-09-2010, 04:27 PM
Grimracer's Avatar
Grimracer Grimracer is offline
Intermediate Rocketeer
 
Join Date: Feb 2010
Posts: 69
Default

Thanks.. I think the spin might have been brought on by the camara.. Not sure I can get that out or not.. maybe I will just not worry about it.

Thanks again

Grimracer
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 05:27 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024