Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #11   Report Post  
Old May 5th 19, 03:18 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Jul 2006
Posts: 228
Default Springs in a Mold

On Thu, 2 May 2019 15:02:46 -0700, Bob La Londe
wrote:

Since its new to me I figured I'd just use springs from my junk
collection and measure the force of the springs. Then order springs to
suit after that. I set up a little jig a while back to measure travel
of springs under weight on a platform for calculating spring force. I
was doing some airgun modifications. Its a pretty simple tool and easy
to make.

I never would have thought to look for "mold springs" or "square mold
springs." Thanks.

Since there is some heat in when injecting thermo plastics I was
concerned about spring life.


Rotational molds often use springs to even out the pressure of the
clamps holding the lid closed. They survive many trips through a
~400 degree Fahrenheit oven... Do eventually need replacing. And we
used both round and square cross section springs.

Used auto valve springs my son got for me at a junk yard for the one
mold I made.
http://alt-config.net/msbh/firstmold.html
--
William

  #12   Report Post  
Old May 5th 19, 05:32 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Aug 2012
Posts: 1,459
Default Springs in a Mold



"William Bagwell" wrote in message
...

On Thu, 2 May 2019 15:02:46 -0700, Bob La Londe
wrote:

Since its new to me I figured I'd just use springs from my junk
collection and measure the force of the springs. Then order springs to
suit after that. I set up a little jig a while back to measure travel
of springs under weight on a platform for calculating spring force. I
was doing some airgun modifications. Its a pretty simple tool and easy
to make.

I never would have thought to look for "mold springs" or "square mold
springs." Thanks.

Since there is some heat in when injecting thermo plastics I was
concerned about spring life.


Rotational molds often use springs to even out the pressure of the
clamps holding the lid closed. They survive many trips through a
~400 degree Fahrenheit oven... Do eventually need replacing. And we
used both round and square cross section springs.

Used auto valve springs my son got for me at a junk yard for the one
mold I made.
http://alt-config.net/msbh/firstmold.html
--
William


*************
When I started thinking about heat affected springs I thought of automotive
valve springs as well. Might not hurt that I've been thinking about
hotrodding small engines lately, and one common requirement is putting in
heavier valve springs (to prevent floating a valve) when upping the RPM.



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do you think mold can be killed with mold? [email protected] Home Repair 3 September 30th 08 04:22 PM
China Mold Manufacturers B2B Directory - Mold Sources [email protected] Home Ownership 0 April 14th 08 05:07 AM
China Mold Manufacturers B2B Directory - Mold Sources [email protected] Home Repair 0 April 14th 08 05:02 AM
Fix for sagging sofa springs [email protected] Home Repair 4 January 3rd 04 02:20 PM
CPU-socket (370) & cooling block: screws with springs, how tight? peter dingemans Electronics Repair 0 September 17th 03 02:35 PM


All times are GMT +1. The time now is 02:24 PM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017