Free 186 More Best Homemade Tools eBook:  
Get 2,000+ tool plans, full site access, and more.

User Tag List

Results 1 to 5 of 5

Thread: Perforated panel excess punching tool - GIF

  1. #1
    Content Editor
    Supporting Member
    Altair's Avatar
    Join Date
    Aug 2013
    Thanked 30,079 Times in 9,991 Posts

    Perforated panel excess punching tool - GIF

    186 More Best Homemade Tools eBook

  2. #2
    Supporting Member Toolmaker51's Avatar
    Join Date
    Feb 2016
    Midwest USA
    Thanked 2,983 Times in 1,893 Posts

    Toolmaker51's Tools
    Unsure why this is needed. Most injection molds "shut off" to prevent flash. Might be inadequate clamp pressure; large hydraulic cylinder opens and closes the mold halves. Tonnage required is calculated mainly by total surface area and injection pressure x time needed to fill while the material is still hot enough to flow. This drain thing might need 1200+ tons.
    Largest molds I ever built and hung ran in a 3000 ton press. Just 1 mold half, 29,000 pounds. The busboy box that's about 18"x 20" x 24" started as a pair of 11 ton blocks. With all the machine work carving out the cavity and cooling holes, took out about 3 thousand pounds, which the core made up. Wall thickness of the box is .125.
    In dieset terminology the punch enters the die opening, just like a paper punch. In molds, the 'punch' is the core, die is the 'cavity'. . ., and cores in casting are the interior of a body, such as a manifold or valve.

    2000 Tool Plans
    ...we'll learn more by wandering than searching...

  3. The Following 4 Users Say Thank You to Toolmaker51 For This Useful Post:

    baja (Aug 4, 2022), Frank S (Aug 3, 2022), mdhatter3 (Aug 3, 2022), Tonyg (Aug 4, 2022)

  4. #3
    Supporting Member
    Join Date
    Apr 2016
    Buffalo, NY
    Thanked 54 Times in 49 Posts
    We learn something new every day. Thanks Toolmaker 51 for the education.

  5. #4
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Peacock TX
    Thanked 8,843 Times in 4,231 Posts

    Frank S's Tools
    You can't appreciate the amount of work involved in mold making until you are asked to make one large or small the devil is in the fit and intricacy of design. Try making one for a 12x4.00x8 semi solid neoprene tire on a Bridgeport with full manual only with little more than an18" rotary table with a 36" face plate mounted on it as the only special tooling available Fortunately we started out with a 2" thick plate than had been Blanchard ground on both flat faces to make the upper and lower cavities the core started out as a 3 inch thick disk. the core was easy done mostly on the lathe, but the cavity plates were too large for me to chuck and swing in my lathe. Hallowing out the shapes of the tire wasn't too bad just a lot of material to be removed but when it came time to add the raised lettering of all the text that had to be done with a dermal and a template I made. All in all a fun though arduous project for a small machine shop just starting out back in the early 1990s
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  6. #5
    Supporting Member carl blum's Avatar
    Join Date
    Nov 2021
    Charleston, South Carolina
    Thanked 61 Times in 31 Posts

    carl blum's Tools
    Hi Gang: Also don't forget the coefficient of expansion! Molds are run hot and the parts still need to fit when hot to avoid flash. And the problem gets worse as molds get larger. We were running a headlight mold in Michigan and had to build a wall around the press to keep outside cold air away. The mold made 4 headlights in two shots, one clear and one black. The mold base was a 5 foot cube.

    186 More Best Homemade Tools eBook

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts