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Pin Connectors V2

by tbuser, published

Pin Connectors V2 by tbuser Aug 5, 2011

Description

The pins in this version are a little stronger and their slightly different shape makes them easier to insert and less likely to break. It also lets you make pegs which are printed horizontally so they are much stronger. Pegs can be used to join two parts that have holes in them. The pinholes also now have a small bevel in them to help make it easier to insert.

The syntax is totally different as well. It was kind of dumb to use global variables in the last version, now you pass the variables to each method so it's easier to have pins of various sizes in one project.

Recent Comments

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good work here!

Hmmmmmm....

I have a use for these!

I just uploaded a new version that I'm much more happy with. One thing I did notice was that pins printed at 0.4 layer height are not as strong as 0.3 layer height. Also, the width over thickness ratio seems to make a big difference as well - 1.67 w/t are much stronger than my other profile that had a 1.5 w/t.

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Instructions

// h = shaft height
// r = shaft radius
// lh = lip height
// lt = lip thickness

module pin(h=10, r=4, lh=3, lt=1, side=false)
// side = set to true if you want it printed horizontally

module pintack(h=10, r=4, lh=3, lt=1, bh=3, br=8.75)
// bh = base_height
// br = base_radius

module pinpeg(h=20, r=4, lh=3, lt=1)
// h = in this case, h is the length of both pins combined

module pinhole(h=10, r=4, lh=3, lt=1, t=0.3, tight=true)
// t = tolerance
// tight = set to false if you want a joint that spins easily

Comments

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STIdeas on Jul 16, 2013 said:

good work here!

TheRuttmeister on Aug 21, 2011 said:

Hmmmmmm....

I have a use for these!

tbuser on Aug 8, 2011 said:

I just uploaded a new version that I'm much more happy with. One thing I did notice was that pins printed at 0.4 layer height are not as strong as 0.3 layer height. Also, the width over thickness ratio seems to make a big difference as well - 1.67 w/t are much stronger than my other profile that had a 1.5 w/t.

emmett on Aug 6, 2011 said:

Hmm, this is the first part I've made where OpenSCAD has given me a non-manifold STL. The holes are fine, but the pins seem to have a problem. Netfabb fixed it for me, but this should definitely be looked into. Especially since I didn't think OpenSCAD *could* make a non-manifold STL, given that it's built on CGAL.

tbuser on Aug 6, 2011 said:

I did have a problem with the pegs, but I thought I fixed it. What code exactly resulted in a non-manifold stl?

emmett on Aug 5, 2011 said:

Perfect! I was just thinking how nice it would be to have access to the tolerance values. The shape looks better too; I'll definitely be using these soon.

DigitalBytes on Aug 5, 2011 said:

Printing this now. I printed the previous version and broke two of the pins trying to insert them. The bevel at the front of the pin looks like it will solve my problem.

Are you printing with ABS or PLA?

DigitalBytes on Aug 6, 2011 said:

I am using ABS as well. I printed out plate.stl but I cannot get the pins to fit in any of the holes. I have broken two of the push pin type pins trying to get them together.

It seems to me that because of the layered extrusion process the flat pins will be substantially stronger than the push pins in their current configuration. It may make sense to make push pins that can also be printed flat. They would look like a T instead of a pin with a cap. Printing the first s
et and breaking two push pins seems to support this theory.

If I get some working T pins I will send you the updates.

tbuser on Aug 5, 2011 said:

I'm using ABS which will tend to bend more than PLA. If PLA is too brittle, you might want to try the horizontal pegs and/or reduce the lip thickness so it doesn't have to flex quite as much.

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