Efferman's Custom Parts

[efferman]

ok, if this works, we will have a XL linear actuator. 3 studs thick and a movement range of 18 studs. But actually there is no end stop at the open end of the actuator to save costs of printing. if the thread is working i will make a case which delivers the endstop. at the bottom end a PF L can placed direct to the holder

[PROlego]

Wow! Price?

[efferman]

35,08€

Edited August 31, 2014 by efferman

[PROlego]

I'll have to wait... Do you plan to add clucth?

[efferman]

yes, but first the actuator has to work

[efferman]

a actuator case for the 13L Gearrack. to use as front shield actuator for example

[N-4K0]

How does it work? Is the gear rack pushed out with the help of a gear?

[efferman]

Yes, it uses a 12 tooth double bevel gear.

[Dafgek81]

Hello Efferman,

Did you read the topic of the L580 from Mlonger?

About the bucketproblem with the new Volvo bucket.

A chance for a fitting design?

A bigger bucket, but one that will fit that loader, the excisting one is a bit smal, it should be wider than the original in my opinion.

And higher if possible.

[efferman]

The chance is existing, but it is extremely expensive.

[Dafgek81]

About €80,- expensive?

[efferman]

https://www.shapeways.com/model/1965101/high-tilt-bucket.html?li=user-profile&materialId=6

In relation to this, which has the same size like the volvo bucket, i guess more 90 to 100 euros

[Dafgek81]

Yes, but that one is bigger and has more material due to the pivotpionts of the high tilt installation.

But if you could design one, we will see what it will cost.

[efferman]

how large the bucket should be and which bucket should be the archetype?

[Dafgek81]

It has to fit the Libherr L580 by Mlonger, don' t know the exact dimensions it should be, maybe you could ask him.

The new Volvo bucket is to big and the 8265 bucket is a bit smal in my opinion.

So something in between those two.

Edited September 4, 2014 by Dafgek81

[rm8]

Here is a 20Z differential practical test.

WIP black truggy was equipped with RC tires and efferman's compact differentials. Cause of friction inside the diff, diffs work like limited slip differentials. That is good:)

Edited September 8, 2014 by rm8

[efferman]

Iam glad that it works good for you

[M_longer]

It has to fit the Libherr L580 by Mlonger, don' t know the exact dimensions it should be, maybe you could ask him.

The new Volvo bucket is to big and the 8265 bucket is a bit smal in my opinion.

So something in between those two.

Ech... Volvo bucket fits dimensions of L580.

[Dafgek81]

Well ok, it fits, but you sad yourself it will not work because off the middle LA, what would be the right option in your opinion?

If not smaller, maybe a mod on the topside of the bucket?

[M_longer]

Well ok, it fits, but you sad yourself it will not work because off the middle LA, what would be the right option in your opinion?

If not smaller, maybe a mod on the topside of the bucket?

It will work IF middle LA will be placed closer to the cab. I have built frame for new loader, which has different setup of LAs and it works smoothly. BTW, building frame for a loader in one day is quite funny.

[efferman]

second revision of the extra large actuator

It has a moving range of 18 studs, an internal planetary 4 to 1 gearbox with integrated clutch. to save material i have made a crossaxle pistonrod. round 2x2 bricks will complete it. Unfortunately this solution allows only to push and not to pull. Fortunately mobile cranes dont need the pull function

i have ordered it and it will me arrive in roundabout 10 days.

Edited September 16, 2014 by efferman

[Blakbird]

Wow, that is one impressive actuator!! Do you think the internally threaded sleeve will be able to spin inside the barrel with all that contact area? It may need to be lubricated. The planetary reduction is a cool idea. I assume it uses 8 tooth pinion gears for planet and sun.

I like the idea of using 2x2 bricks to make the piston. In fact, by using different length cross axles you could make an actuator with different stroke. This also allows us to buy some chrome 2x2 round bricks for the piston! Compression strength should be very good.

I am a little worried about the precision of the gear teeth and threads. I hope they move smoothly. Does this part need to be polished? I also think that with no thrust bearing the sleeve may have trouble turning under load.

Let me make sure I understand the planetary system. The input will be the sun gear. The ring gear will be fixed to the housing and therefore not rotate. The planet carrier is connected to the internal threads and drives the piston screw, so it is really the orbit of the planets that makes the whole thing work. What keeps the ring gear from spinning in the housing? What locks the planet carrier to the sleeve?

The piston is guided by the sleeve at the lower end threads, but there is no guide at the upper end which may cause the actuator to buckle under high compression loads unless the 2x2 bricks fit very closely inside the threads.

I am eagerly looking forward to the results of your testing.

[efferman]

Wow, that is one impressive actuator!! Do you think the internally threaded sleeve will be able to spin inside the barrel with all that contact area? It may need to be lubricated. The planetary reduction is a cool idea. I assume it uses 8 tooth pinion gears for planet and sun.

Yes, it is the same gear setup like in my planet rims

I like the idea of using 2x2 bricks to make the piston. In fact, by using different length cross axles you could make an actuator with different stroke. This also allows us to buy some chrome 2x2 round bricks for the piston! Compression strength should be very good.

The stroke depends on the threads in the spinning pipe, actually there are 60 rotations from full in to full out. To make shorter or longer actuators is no problem if someone needs them. for shorter actuators standard cross axles can be used

I am a little worried about the precision of the gear teeth and threads. I hope they move smoothly. Does this part need to be polished? I also think that with no thrust bearing the sleeve may have trouble turning under load.

The precision of printing is theoretical no problem, practical the nylon shrinks a bit during cool down process. i have to remind to this problem during construction, but crossholes are the only gambling with these shrinks.

The thrust bearing is possibly needed between the planetary gear carrier and the stator gear. Tests will show if it is neccessary.

Let me make sure I understand the planetary system. The input will be the sun gear. The ring gear will be fixed to the housing and therefore not rotate. The planet carrier is connected to the internal threads and drives the piston screw, so it is really the orbit of the planets that makes the whole thing work. What keeps the ring gear from spinning in the housing? What locks the planet carrier to the sleeve?

Yes, the planetary gearbox works like described. The ring gear has 24 bumps on its outer ring and the casing hast 48 opposites. Between both is a ltiitle bit space for mounting and the clutch function. Theoretical this works like the clutch in the large lego actuators, practical it has to be tested.

Look at the picture to see how the planet gear carrier is connected to the spinning pipe.

The piston is guided by the sleeve at the lower end threads, but there is no guide at the upper end which may cause the actuator to buckle under high compression loads unless the 2x2 bricks fit very closely inside the threads.

This problem do have long hydraulik actuators to. They use some guidings to prevent this, in my actuators this should make the 2 stud long thread on the pistion rod bottom. i have more fear that the piston rod bends under load. the piston rod hole in the case is 16,5mm , the 2x2 round bricks a little bit under 16mm in diameter, so ther is not much guidance at the end of stroke.

I am eagerly looking forward to the results of your testing.

me too

[weavil]

I have an idea for the linear valve.

The dark red is for A, green is for C.

Pull out for air to A, Push in for air to C, and Center to close ALL.

Also NOT to scale, just a layout of design.

Larger... http://www.bricksafe.com/files/weavil/Ideas/Untitled.png .

It has 2 holes in the top and bottom for a retainer clip/piece and a hole in the back for a vent.

[efferman]

iam not sure if i understand whats your idea