Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Projects
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 11-12-2006, 05:27 AM
Leo's Avatar
Leo Leo is offline
German Model Rocket Builder
 
Join Date: Sep 2005
Location: Germany
Posts: 1,311
Default

To get this thread going I decided to start with the capsule.

Here the layout of contents:


Step 2

I glued the nose cone and tail cone to the body tube:
__________________
Leo

My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino
Reply With Quote
  #12  
Old 11-12-2006, 07:38 AM
sandman's Avatar
sandman sandman is offline
Custom Cone, Kit & Decal Maker
 
Join Date: Mar 2005
Location: Way North of Detroit
Posts: 4,860
Default

I've been afraid to open mine.

I have a pretty good idea how many parts are involved in that kit.

I have visions of cutting open the box and the parts exploding out all over the shop.

I can't imagine how Carl got all the parts into that teeny tiny box!

Anyway, I decided to wait a bit on mine. I have to get something going on the Nike Hercules first then the Little Joe II.

I have a bunch of Apollo Capsules to do first.
__________________
"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run"

http://sandmandecals.com/
Reply With Quote
  #13  
Old 11-12-2006, 09:23 AM
Leo's Avatar
Leo Leo is offline
German Model Rocket Builder
 
Join Date: Sep 2005
Location: Germany
Posts: 1,311
Unhappy

Everyone, Carl,

I have hit the first snag already

There seems to be a problem with the shroud. I have cut it exactly as per instructions however it seems to be to short. If I were to over lap and glue it as suggested I will never ever be able to move in over the nose cone.

Hope the picture shows what I mean:


I'm going to stop construction right here until I get confirmation and we have a solution.
__________________
Leo

My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino
Reply With Quote
  #14  
Old 11-12-2006, 10:07 AM
sandman's Avatar
sandman sandman is offline
Custom Cone, Kit & Decal Maker
 
Join Date: Mar 2005
Location: Way North of Detroit
Posts: 4,860
Default

Leo,

This type of shroud requires very precise tolerances. What I did on mine was to make copies of the shroud and experiment (my printer can change it in 1% incraments).

The other alternative is to just make the shroud and try to "carefully" adjust the nose cone shoulder with an emery board.

Once you do get it solved it is a lot easier to paint the nose cone before the shroud is glued on.

I know it's hard but you are dealing with some pretty tiny parts so be patient.

Mine shown is the original size...not changed at all. What I wound up doing was recutting the shroud so that the "line" for the top curves was just removed.

That effectively reduced the radius just enough for it to fit on mine.

Did that make any sense???
Attached Thumbnails
Click image for larger version

Name:  capsule.JPG
Views: 350
Size:  78.9 KB  
__________________
"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run"

http://sandmandecals.com/
Reply With Quote
  #15  
Old 11-12-2006, 10:35 AM
Leo's Avatar
Leo Leo is offline
German Model Rocket Builder
 
Join Date: Sep 2005
Location: Germany
Posts: 1,311
Default

Sandman,

so you can also confirm that something is not right.

The difference is several millimeters and I don't plan on cutting up the shroud or taking so much balsa off the nose cone.

Maybe the nose cone is too large?

I hope Carl has a solution without having to do surgery to the kit.
__________________
Leo

My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino
Reply With Quote
  #16  
Old 11-12-2006, 11:28 AM
Sheryl@Semroc Sheryl@Semroc is offline
Craftsman
 
Join Date: Mar 2005
Location: Knightdale, North Carolina
Posts: 189
Default

Leo,

As Sandman said, getting the correct fit on shrouds is not always easy. A nose cone that is .015" oversized will make the difference in the shroud sliding or not sliding over the cone. Lightly sand the shoulder that the shroud slides over. Cutting the line off the top of the shroud will make a few thousandths difference but cutting too much will make the shoud too short.

Estes apparently had the same problem since their original shroud was 1/16" shorter than our redesigned shroud. There are some close tolerances required to get everything to fit properly.

If the sanding doesn't work, I will send you another set of parts (cone and shroud).

Thanks for writing this build thread; it looks good.

Sheryl
Reply With Quote
  #17  
Old 11-12-2006, 11:45 AM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 9,187
Default

The shroud on my LJ II fits. However, I didn't think I'd ever get those dowels sanded down to the right size!


I cut and glued the shroud together, then very lightly sanded the upper part of the shroud opening until it slipped into position on the balsa cone snugly, without deforming.
Reply With Quote
  #18  
Old 11-12-2006, 12:35 PM
Leo's Avatar
Leo Leo is offline
German Model Rocket Builder
 
Join Date: Sep 2005
Location: Germany
Posts: 1,311
Question

Ok, first off I cut the shroud under the black lines and then placed it over the shoulder again. As you can see it didn't help very much. I dare not cut any more away from the shroud.

As you can see in the picture the "overlap" is still visible. I would need to remove 1.5mm from the balsa shoulder.

I curious to know what dimensions other have on their nose cone.

Mine is 32.65mm:


I have the feeling my nose cone turned out too big
__________________
Leo

My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino
Reply With Quote
  #19  
Old 11-12-2006, 02:43 PM
sandman's Avatar
sandman sandman is offline
Custom Cone, Kit & Decal Maker
 
Join Date: Mar 2005
Location: Way North of Detroit
Posts: 4,860
Default

[QUOTE I have the feeling my nose cone turned out too big [/QUOTE]

Yes, it looks like it to me too.

OK, since you are in Germany and a long ways from SEMROC let's see if we can fix it.

Glue the shroud together...or better yet make another copy of it and use the copy.

Glue the "new" shroud together, I'm sure the shroud is correct, let's assume the nose cone is off.

Place the glued shroud "squarly" onto the nose cone.

Now with a fine tipped pencil (not a pen!) scribe around the top edge of the shroud.

Using an emery board carefully and slowly (it won't take long) sand just under the pencil line making a new shoulder.

Better to take too little off than too much!

Leave extra wood and work to the line.

Try that and let us know.

This is fixable!
__________________
"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run"

http://sandmandecals.com/
Reply With Quote
  #20  
Old 11-12-2006, 02:54 PM
sandman's Avatar
sandman sandman is offline
Custom Cone, Kit & Decal Maker
 
Join Date: Mar 2005
Location: Way North of Detroit
Posts: 4,860
Default

I just had a better idea to try!!!

Do you have any BT-55 body tube?

The I.D. of a BT-55 is just a hair bigger than the correct size.

With the BT-55 "SQUARLEY" over the cone make a rotary motion and some slight downward pressure on the cone and make a slight impression in the balsa (very slight...just enough to see a line!)

Now take the glued shroud and try the fit but!!!! with the shoud upside down. This is just to check the fit!

Do you see what I'm trying to say?
__________________
"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run"

http://sandmandecals.com/
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 06:11 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2019