1 Topic by redbarret

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Topic: Filastruder understanding collar position once and for all

I've had problem understanding where the shaft collar has to be on the auger exactly. But I think I'm starting to get the logic  of it.
Please tell me I understood it.

a simple illustration
http://i.imgur.com/sViHBc3.png

The collar shouldn't be any more left in this image otherwise the auger will apply force (push) to the motor and risk damaging it.
The force will be passed to the bearing which is meant for this stuff.
Is that the logic of it?

The next thing is then the distance between the wood on the left (not seen in this illustration) and shaft collar. It has to be specific length to allow the auger to move in the pipe to the left some. Reason is so there will be specific amount of empty space where the auger tip is and the pipe (left) end is. So there will be enough molten plastic in the end of the pipe nipple assembly to extrude appropriately.
And you can find out how much that should be by moving the auger to the left and making sure 1/4'' of the auger sticks out from the pipe, as mentioned in the manual.

Did I finally get it all?

Solidoodle 4

2 Reply by elmoret

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Re: Filastruder understanding collar position once and for all

Its super simple. No need for all of this!

1.) Put shaft collar on 95mm from the end of the auger, as described in the instructions.
2.) Assemble the thrust section, including the 4 main bolts and the spacers.
3.) Pulling the auger so that the thrust bearing is compressed, check that about 1/4" is sticking out.

If 1/4" is not sticking out, move the shaft collar by that amount and repeat steps 1-2. It is not possible to provide a specific position for the collar, because everyone tightens the barrel in the flange differently which changes how far the auger will stick out.

Then when completing assembly (with or without the kit enclosure), be sure to position the gearmotor such that the thrust bearing bottoms out before the hex socket bottoms out - this way, no thrust can be transferred to the gearmotor.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

3 Reply by redbarret

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Re: Filastruder understanding collar position once and for all

elmoret wrote:

Pulling the auger so that the thrust bearing is compressed, check that about 1/4" is sticking out.

Thrust bearing compressed means I should pull the auger to the side of the motor (right in the pic), not the side of the nozzle right?

Then when completing assembly (with or without the kit enclosure), be sure to position the gearmotor such that the thrust bearing bottoms out before the hex socket bottoms out - this way, no thrust can be transferred to the gearmotor.

This is what I said myself and wanted to hear, thanks.

Solidoodle 4

4 Reply by elmoret

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Re: Filastruder understanding collar position once and for all

redbarret wrote:
elmoret wrote:

Pulling the auger so that the thrust bearing is compressed, check that about 1/4" is sticking out.

Thrust bearing compressed means I should pull the auger to the side of the motor (right in the pic), not the side of the nozzle right?

Correct, "compressed" means "pushed together". To push together the 3 parts of the thrust bearing, you would slide the auger away from the nozzle (towards the motor, which isn't mounted yet anyway).

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

5 Reply by redbarret

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Re: Filastruder understanding collar position once and for all

Then all is correct, thanks.

BTW I've always wondered what is the purpose of the nylon bushing?

Solidoodle 4

6 Reply by elmoret

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Re: Filastruder understanding collar position once and for all

It is there to allow even loading of the thrust bearing, by flexing to distribute the force over most or all of the face of the bearing.

Without it all of the thrust would be carried by only a few rollers, depending on how well the parts were aligned during assembly.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

7 Reply by pkearney

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Re: Filastruder understanding collar position once and for all

Hi I am assembling the bearings and there is no nylon bushing in the kit  has this been replaced , kit 807 .The auger allows only allows  85 mm to the end with the collar .cheers

8 Reply by elmoret

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Re: Filastruder understanding collar position once and for all

807 is a very old kit, it is assembled differently. You need to be sure you have the correct instructions, there is no distance to be measured with that kit.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend