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Thread: Desktop injection molding machine lever design

1. Desktop injection molding machine lever design

I'm building a desktop injection molding machine like in this image but i'm confused about the lever design is it second or third class?
I know that the force is 12000 PSI , How can i calculate the arm length? 2505785bc44b79cfea144ec1c788e973 — imgbb.com  Reply With Quote

2. Re: Desktop injection molding machine lever design

Second class -- if that somehow matters.

All such calculations are simply a matter of Force x Distance = Force X Distance, regardless of where the fulcrum is located.

You'll need to know plunger diameter to calculate psi loading. Gotta know the square inches, there.  Reply With Quote

3. Re: Desktop injection molding machine lever design

My plunger diameter will be 15 mm, How can i calculate psi loading?  Reply With Quote

4. Re: Desktop injection molding machine lever design

Convert to inches (/25.4) then divide by 2 (radius,) square and multiply by pi (area formula.)  Reply With Quote

5. Re: Desktop injection molding machine lever design

12000 PSI is the pressure in pounds per square inch. Multiply it by the area on which that pressure is acting (ie the piston face) gives you force in pounds. That force divided by the force you want swinging on the handle (what, 60lb max?) is the gain the lever needs. Which in turn gives you the length of the handle.  Reply With Quote

design, desktop, injection, lever, machine 