Efferman's Custom Parts

[Balrog]

We have to buy an Eurobricks public printer hahaha.

That will be permanently in use by efferman

[PROlego]

Well anyone who uses it has to pay the material haha.

[z3_2drive]

I'm interested in buying some of your Shapeways creations but I have one question, do you think the high-torque diff is ready for testing? It looks very promising but it's still in Beta.

[efferman]

sariel is testing the high torque diff. i think can give you a answer next days

[z3_2drive]

Sariel responded and I decided not to buy the high torque diff. Maybe sometime in the future. Here's what i did get:

• U-Joint with slide
  
• 12 tooth bevel with axle
  
• Curved liftarm 4x11
  
• Heavy duty U-Joint
  
• 5m pushrod 90 degrees
  
• Axle Support Frame
  
• Driven Steering Hub small
  
• Clutch 24
  
• Gear Rack 9L
  
• MacPherson steering hub
  
• Planet gearbox 4:1
  
• Male CV joint 2m 8 piece set
  

If you need feedback on any of these parts, they should arrive by the 22nd. Thanks for making these models!

[efferman]

thanks for ordering. Feedback is every time welcome but the mcpherson parts and the male cv joints are most interesting this time

[fasterthanlight]

Hey efferman - I'm curious as to what changes you might be making to the HD turntable are? I think I remember reading somewhere recently that you are going to modify it in some way ...

[efferman]

there are are two changes:

first i have saved material to make it cheaper

and second i switch to outside gearing with 89 teeths for using wormgears directly. next week i will see how good,or bad, both works

[automatic71]

Regarding McPherson parts:

The three-pin Lego hub part fits, but it's veeery tight, diameter of the bore should be increased a bit and depth maybe reduced by 0.5 mm. Currently there is no free wheel spin unless you treat everything with sandpaper.

The "Ball" for the lower suspension arm is a bit too small, generating play and wobble.

Spring and corresponding upper spring part fit perfectly

[efferman]

thank you very much for the feedback. was your part polished from shapeways or not?

[automatic71]

No, basic material in red, which fits more or less the Lego red.

No, basic material in red, which fits more or less the Lego red.

[efferman]

Ok, red is always polished. Thanks for the info i will fix the problems.

[efferman]

Z3_2drive, i have updated the mc pherson part, i hope they will use it for your part. the ball and the hole for the 3pin part are a tenth bigger.

btw, is there a need for a longer small linear actuator?

Edited October 8, 2014 by efferman

[Auranapse]

Is it possible to create a clutch type limited slip diff? Or rather any other types of limited slip diffs? Since the torsen lsd doesn't work.

[efferman]

i think i have a idea for this

[AndyCW]

I purchased and have been testing the portal hubs along with the u-joints. I am running 2x unrestricted 5292 motors through them. So far so good.

This rock bouncer I m building is pretty stout. About 5:1 gearing, 3 cell Lipo, after market tires, and less than 1.5 Kg.

v/r

Andy

[efferman]

iam happy that you like it

btw, a small aktuator with a stroke of roundabout six studs which can not rotate

[efferman]

Is it possible to create a clutch type limited slip diff? Or rather any other types of limited slip diffs? Since the torsen lsd doesn't work.

do you think this would work?

[VKTechnic]

That's a very interesting concept, but I think it does the opposite of a normal LSD. Normal LSDs allow for small differences in speed (such as that in cornering) and lock when one wheel loses traction. This one won't allow for slip at low differences, but will slip under high torque.

[efferman]

then it should called limited lock diff?

[VKTechnic]

Not sure...It doesn't act like a diff anymore except in a few circumstances.

[efferman]

i have made yesterday a little research about LS diffs and they are made with springs and clutch plates. iam working on something like this but iam not sure if this works in real with its more than 10 parts (without lego gears)

but i think this works, even when i dont know why shapeways have these steps on the blades. These propellors are left and right so the boats should not have a tendece to move to the side. When someone wants to test it with one of his boats, please try different RPM ratios. as far as i know bot propellors have all an optimal range of rpm, to fast and they only make bubbles.

[Leewan]

even when i dont know why shapeways have these steps on the blades.

I think it's because of your model's polygons.

Have you ever tried printed nylon parts in water ? Isn't there any risk ?

[efferman]

Nylon is waterproof as far as i know

[aol000xw]

Fishing lines are made of nylon so no problem even in saltwater

Your parts catalog has grown quite a bit, nice parts everywhere!