I have made many upgrades for the k8200.
- 24vdc power supply + stepdown converter for 15vdc
- E3D V6 extruder
- removed z-ax holder
- glass plate
- Fan for cooling filament.
- 2 M8 nuts with spring on leadscrew
- enz.
and i have installed a trapezoidal leadscrew TR8x1,5
but i am a bit dissapointed about the results of the leadscrew.
the results are not better then the old M8 leadscrew, the M8 leadscrew gives a better result.
The TR8x1,5 i have ordered came with 1 TR8 nut, but now i wat to try with 2 nuts and spring.
I don’t want to buy a seccond nut, because i doe not know if it works.
Does somebody know if there is a 3D model of a TR8x1,5 nut, so i can print a nut?
I have found a TR10x2 nut, but i don’t know how i can change it to a tr8x1,5.
I hope somebody have a model, or do know where i can find one
[quote=“dutchronnie”]I have made many upgrades for the k8200.
- 24vdc power supply + stepdown converter for 15vdc
- E3D V6 extruder
- removed z-ax holder
- glass plate
- Fan for cooling filament.
- 2 M8 nuts with spring on leadscrew
- enz.
and i have installed a trapezoidal leadscrew TR8x1,5
but i am a bit dissapointed about the results of the leadscrew.
the results are not better then the old M8 leadscrew, the M8 leadscrew gives a better result.
The TR8x1,5 i have ordered came with 1 TR8 nut, but now i wat to try with 2 nuts and spring.
I don’t want to buy a seccond nut, because i doe not know if it works.
Does somebody know if there is a 3D model of a TR8x1,5 nut, so i can print a nut?
I have found a TR10x2 nut, but i don’t know how i can change it to a tr8x1,5.
I hope somebody have a model, or do know where i can find one[/quote]
Look for screw library on thingiverse.
There you will find a parametric SCAD library for leadscrews.
Only thing is, i don’t believe you will be able a M8x1.5 nut with the necessary precision …
How do you have your leadscrew mounted?
Flex coupler between screw an motor?
Is the screw straight?
cheers,
Christian
The leadscrew library i have already found, but it doesn’t contain a TR8x1,5 Nut, only a TR10.
I want the printed nut only using for holding the spring, the original must be precise enough.
I have the leadscrew mounted exect i have mounted the M8 leadscrew.
The stepper motor on the underside, with flex coupling to the leadscrew.
The top of the leadscrew is not mounted in a holder.
This setting give very good results with the M8 leadscrew.
But with TR8 i was suspection a better result as a M8, but it wasn’t
[quote=“dutchronnie”]The leadscrew library i have already found, but it doesn’t contain a TR8x1,5 Nut, only a TR10.
I want the printed nut only using for holding the spring, the original must be precise enough.
I have the leadscrew mounted exect i have mounted the M8 leadscrew.
The stepper motor on the underside, with flex coupling to the leadscrew.
The top of the leadscrew is not mounted in a holder.
This setting give very good results with the M8 leadscrew.
But with TR8 i was suspection a better result as a M8, but it wasn’t[/quote]
Maybe try this : thingiverse.com/thing:648925
This is the thread library i meant : thingiverse.com/thing:8793
I have already printed the parts, but i have another trapezoidal nut, so i have to change some parts.
I have found the library, but i don’t know how it works.
must have to study, but as far as i can see it makes only the leadscrew, and i want to make a nut
I have already printed the parts, but i have another trapezoidal nut, so i have to change some parts.
I have found the library, but i don’t know how it works.
must have to study, but as far as i can see it makes only the leadscrew, and i want to make a nut[/quote]
it comes accompanied by another library that generates the therads, ther sould be also functions for nuts in it.
[quote=“dutchronnie”]I have the leadscrew mounted exect i have mounted the M8 leadscrew.
The stepper motor on the underside, with flex coupling to the leadscrew.
The top of the leadscrew is not mounted in a holder.[/quote]
So you have your leadscrew mounted on top of a spring (the flexible coupler) and you’re wondering why the layers aren’t even?!
I’m getting good results be having the stock leadscrew pulled upwards by the top bearing (flexible coupler under tension).
I had the M8 leadscrew mounted this way between 2 nuts and a spring.
This gave almost a perfect layer.
But when i upgraded to a TR8 leadscrew with only one nut, the results become bad.
I don’t have a second TR8 nut, so i wanted to print one.
I have found the screw library, but i can not get a good TR8 nut out of it.
I have my trapezoidal leadscrew mountes top down, so a hanging z axis, secured by a bearing wich is clamped between the
flex coupling and a plastic clamp.
This also frees the motor from any axial load.
(I think you know my hanging mount on thingiverse?)
cheers,
Christian
I know, and i will ceretainly print this mount and use it.
But it will be on a later time.
My lead nut doesn’t fit your mount, i need to change it
how did you lead the motor wiring to the motor?
I know, and i will ceretainly print this mount and use it.
But it will be on a later time.
My lead nut doesn’t fit your mount, i need to change it
how did you lead the motor wiring to the motor?[/quote]
Well, to my shame i was lazy and left it hanging down freely beneath the spindle till now. 
But i’m currently doing a complete rewiring.
Therefore i will route the motor z cable along the top traversal and then down to the controller.
I already made a topic on this, but i didn’t have the time to complete it.
I will post pictures of the rewiring there as soon as i’m finished.
cheers,
Christian
Thanks Cristian,
another question.
I don’t understand the counter nut in your design.
What is it doing?
it is only mounted around the z-ax, it doesn’t hold anything in my opinion.
it is mounted under the bearing holder.
[quote=“dutchronnie”]Thanks Cristian,
another question.
I don’t understand the counter nut in your design.
What is it doing?
it is only mounted around the z-ax, it doesn’t hold anything in my opinion.
it is mounted under the bearing holder.[/quote]
It is just there to remove backlash.
The bearing is “clamped” between the Flex coupler and the “counter nut”, so the axis doesn’t shift if changing direction.
cheers,
Christian
Oke, backlash.
Maybe it is better to use a spring for backlash.
I am a little bit frustrated now, a have printed some parts to mount the nut for the leadscrew.
but every print i have maked the nut doesn’t fit.
i have checked the calibration of the printer, and everything is right.
i have the extrusion multiplier on 0.9 and stil it doesn’t fit.
very frustrating, and it sesms i didn’t get it good.
[quote=“dutchronnie”]Oke, backlash.
Maybe it is better to use a spring for backlash.
I am a little bit frustrated now, a have printed some parts to mount the nut for the leadscrew.
but every print i have maked the nut doesn’t fit.
i have checked the calibration of the printer, and everything is right.
i have the extrusion multiplier on 0.9 and stil it doesn’t fit.
very frustrating, and it sesms i didn’t get it good.[/quote]
Not backlash of the nut, backlash of the rod. The “nut” only arrests the rod in the bearing against the flex coupler.
If the rod is only held on the upper side it can shift upwards against the flex coupler when the z axis moves down.
The leadscrew nut itself has practically zero backlash. (at least the one that comes with the velleman upgrade)
As i said, printing a leadscrew nut that small will be nearly impossible with and FDM printer.
cheers,
Christian
ok clear.
the printed nut is only for the second nut, not for the main nut.
I have build your setup cristian. but get another bad thing.
i have to reverse the z motor, but i can not compile the firmware anymore. it is hanging.
i use version 1.0.6 arduino, and in the past i was able to update the firmware.
Edit,
I have updated the firmware now, and everything is working fine.
The first prints are equal in quality as with the motor on the underside.
Question Cristian,
Is the flex motor coupling resting on the bearing or is it above the bearing, can not see it on the pictures.
[quote=“dutchronnie”]I have build your setup cristian. but get another bad thing.
i have to reverse the z motor, but i can not compile the firmware anymore. it is hanging.
i use version 1.0.6 arduino, and in the past i was able to update the firmware.
Edit,
I have updated the firmware now, and everything is working fine.
The first prints are equal in quality as with the motor on the underside.
Question Cristian,
Is the flex motor coupling resting on the bearing or is it above the bearing, can not see it on the pictures.[/quote]
The bearing is “clamped” between the flex coupler and the “counter nut” part, to secure the leadscrew in place.
If you get the motor -> bearing -> leadscrew nut aligned properly it should work like a charm.
I didn’t test it with the stock M8 screw but i’m sure it will improve that also.
cheers,
Christian
Thanks cristian, everything is working now.
Now i go on to the next improvement, i shall open a new topic about that.
Have questions about that to.