Mendel Extruder stepper motor gear or no gear that is the question?:S Mendel Extruder stepper motor gear or no gear that is the question?:S I have made the Mendel Extruder body to scale. On fitting the stepper with a Conrad serrated gear (its not really a gear but a drive shaft connector) Fitting is too tight. Now looking through all the Mendel stuff I see no mention of a gear. I cant find anything indicating what you fit or do to a Mendel extruder stepper motor shaft. If you have already built this part what did you do at this point? I think if a gear is neded it should be in the BOM or if I need to Dremel the shaft of the motor some place it shoud say this in prepration of materials. I dont want to Dremel the shaft if that is not how you build the Mendel extruder. Thou ~I cant imagine getting a gear smaller that that on the Conrad coupler. https://reprap.org/forum/read.php?4,33098,33098#msg-33098 Mon, 18 May 2026 11:42:31 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,33098,39749#msg-39749 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,39749#msg-39749
Making a worm gear style pinchwheel (like Nophead's designs) worked out much better - smooth operation, great pull (16 kg on PLA), and easy to make - all it takes is a hand drill, file, and an M3 tap, plus a few skate bearings and a vice (or a Reprap).

Details on the wiki:
[objects.reprap.org]

Wade]]> Wade Reprappers Wed, 17 Mar 2010 17:59:44 -0400 https://reprap.org/forum/read.php?4,33098,39584#msg-39584 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,39584#msg-39584
Made by chain drilling a ring of holes in to the end of a bar, then turning off the material around the holes to leave a pointy spline.

We have used this technique for making friction drive gears in industry.

It is equally possible to leave a cheek on either side of the spline then use a plain bearing in-between the cheeks to hold the filament against the spline.

Si
]]> Simon Rafferty Reprappers Tue, 16 Mar 2010 13:38:26 -0400 https://reprap.org/forum/read.php?4,33098,33692#msg-33692 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33692#msg-33692
Just getting an extruder to extrude reliably needed as a stepping stone.

Towards that goal of improving the extruder resolution.

As it allows the printing of a more complex worm gear extruder head parts.

Thinking about worm gears and where to get some to play with.

OO gauge trains and Minic cars though they might be too small.

As I had Minic I don't know the drive mechanism for Scalextric cars was it also a worm drive?

Using Mecano you can still buy (32b) Narrow Worm Gear 7/16" Dia Brass (Meshes With 27d) to get a 60:1 ratio that would give 2800 steps a rev using a 7.5 degree stepper giving 0.0056mm per step.

So each step would produce 0.158^3mm of plastic extruded I think..]]> BodgeIt Reprappers Fri, 22 Jan 2010 15:33:37 -0500 https://reprap.org/forum/read.php?4,33098,33690#msg-33690 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33690#msg-33690
So, I think if we are gearing things we should aim for something around a 100:1 ratio. I think we should be able to find some very cheap motors to drive it at that point as well.]]> mccoyn Reprappers Fri, 22 Jan 2010 14:36:52 -0500 https://reprap.org/forum/read.php?4,33098,33689#msg-33689 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33689#msg-33689

8 times microstepping should get me right down to 0.1 mm though - that'd be just about right. Have to put together a microstepping stepper driver. For this test I've just been using an extruder controller in stepper mode.

The pinchwheel gear teeth on this one cause speed stability problems though, I think I'll try something similar to Nophead's hobbed pinch wheel next.

Wade]]> Wade Reprappers Fri, 22 Jan 2010 14:14:16 -0500 https://reprap.org/forum/read.php?4,33098,33687#msg-33687 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33687#msg-33687 nophead Reprappers Fri, 22 Jan 2010 14:03:32 -0500 https://reprap.org/forum/read.php?4,33098,33683#msg-33683 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33683#msg-33683
Do you have any maximum torque figures for an unmodified extruder?]]> BodgeIt Reprappers Fri, 22 Jan 2010 13:16:39 -0500 https://reprap.org/forum/read.php?4,33098,33682#msg-33682 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33682#msg-33682
[objects.reprap.org]

Wade]]> Wade Reprappers Fri, 22 Jan 2010 12:35:19 -0500 https://reprap.org/forum/read.php?4,33098,33611#msg-33611 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33611#msg-33611
Its first job will be to print the more complicated extruder block required for a geared extruder and the two gears.

The extruder drive is the key component that is I think the most dificult component to scratch build as it requires more far more acurate parts to work perfectly.]]> BodgeIt Reprappers Thu, 21 Jan 2010 17:54:36 -0500 https://reprap.org/forum/read.php?4,33098,33582#msg-33582 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33582#msg-33582 dissidence Reprappers Thu, 21 Jan 2010 13:24:29 -0500 https://reprap.org/forum/read.php?4,33098,33548#msg-33548 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33548#msg-33548 Those gears look nice.

The only way I can think of to make the hub strong enough is to have metal insert made from hex bar, as I did here: [hydraraptor.blogspot.com]]]> nophead Reprappers Thu, 21 Jan 2010 04:50:05 -0500 https://reprap.org/forum/read.php?4,33098,33487#msg-33487 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33487#msg-33487
Now I'm experimenting with a geared version; although my printed gears are not quite ready for primetime yet. Looks like I'm going to have some issues transferring the output torque from the driven gear to the pinchwheel axle without destroying the gear hub, but I'm working on it. Here's a photo of my first try, which doesn't work yet:



]]> Wade Reprappers Wed, 20 Jan 2010 21:57:20 -0500 https://reprap.org/forum/read.php?4,33098,33283#msg-33283 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33283#msg-33283
I did managed to do a PCB toner transfer without the use of water or the need to rub off wet paper gently.

I have set the temprature of ARNIE PID to 48C waiting for the etchant to get up to temprature before I pop a Single sided Arduino in to etch.

Its looks good so far though May try cutting splines while I wait..]]> BodgeIt Reprappers Tue, 19 Jan 2010 14:06:16 -0500 https://reprap.org/forum/read.php?4,33098,33246#msg-33246 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33246#msg-33246
That is why I rejected this otherwise nice and simple design and went for a geared solution.]]> nophead Reprappers Tue, 19 Jan 2010 07:25:33 -0500 https://reprap.org/forum/read.php?4,33098,33195#msg-33195 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33195#msg-33195 -------------------------------------------------------
> It uses splines cut into the motor shaft with a
> Dremel and a jig I believe.
>
> This sounds like something we need to automate
> further. :)

It shouldn't need to be something we automate, we should be able to use any sized Spur Gear or splined sleeve we like and adjust the bearing close to it, then tension it up.

There are available toothed pulleys with grub screws, so it would be a good idea to use that than relying on using a Dremel or rotary tool (or file) to do no more than put a flat onto the shaft.]]> Grogyan Reprappers Tue, 19 Jan 2010 01:33:00 -0500 https://reprap.org/forum/read.php?4,33098,33184#msg-33184 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33184#msg-33184 objects.reprap.org]]]> johnnyr Reprappers Mon, 18 Jan 2010 23:54:50 -0500 https://reprap.org/forum/read.php?4,33098,33177#msg-33177 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33177#msg-33177 It uses splines cut into the motor shaft with a Dremel and a jig I believe.

This sounds like something we need to automate further. :)]]> SebastienBailard Reprappers Mon, 18 Jan 2010 22:25:20 -0500 https://reprap.org/forum/read.php?4,33098,33109#msg-33109 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33109#msg-33109
May be its a case of a little knowledge was too much knowledge as there is no need for a gear or splines on the shaft.. I think for those with the little knowledge it should clarify this point in the instructions.

Well thats what I think now unless someone knows better??

I know better now it fails to work without a gear or splines. :(

So I guess its splines as even the Conrad Gear is too big to fit.. Thanks Nophead]]> BodgeIt Reprappers Mon, 18 Jan 2010 09:33:02 -0500 https://reprap.org/forum/read.php?4,33098,33105#msg-33105 Re: Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33105#msg-33105 nophead Reprappers Mon, 18 Jan 2010 09:01:31 -0500 https://reprap.org/forum/read.php?4,33098,33098#msg-33098 Mendel Extruder stepper motor gear or no gear that is the question?:S https://reprap.org/forum/read.php?4,33098,33098#msg-33098
I have made the Mendel Extruder body to scale.

On fitting the stepper with a Conrad serrated gear (its not really a gear but a drive shaft connector)

Fitting is too tight.

Now looking through all the Mendel stuff I see no mention of a gear.

I cant find anything indicating what you fit or do to a Mendel extruder stepper motor shaft.

If you have already built this part what did you do at this point?

I think if a gear is neded it should be in the BOM or if I need to Dremel the shaft of the motor some place it shoud say this in prepration of materials.

I dont want to Dremel the shaft if that is not how you build the Mendel extruder.

Thou ~I cant imagine getting a gear smaller that that on the Conrad coupler.]]> BodgeIt Reprappers Mon, 18 Jan 2010 07:55:37 -0500