Saturday, August 15, 2009

X and Y axis sliders method 3

X and Y axis sliders method I have just tyed this method wich is even simpler it avoids using skate bearings altogether and just uses the Nylon corner fixing blocks.

I am total amazed by this one I expected this to have more friction than the skate bearings and for it to have a lot of play.. neither is the case it is also very very much lighter as it has not got 32 skate bearings. I cant belive how simple the X & Y mechanisims are now and its £16 cheaper to buy..


Here are the pictures of the construction.. :-




Y slider build

Materials :-

8 Nylon corner fixing blocks with the central hole drilled out to 8mm.
4 Nylon corner fixing blocks with the central hole drilled out to 8.5mm.
4 Nylon corner fixing blocks as they come.
2 8mm Steel bar 500mm long
8 4mm machine screws 50mm long.
4 4mm machine screws 30mm long.
12 4mm nuts.
1 ASDA / Wallmart flat chopping board cut to the drawings supplied.

Tools used:-
Pedestal drill, 22mm wood bit, 8.5mm, 8mm, 4mm, 3mm drills, Wood saw and vice.
or
Hand held drill, 22mm wood bit, 8.5mm, 8mm, 4mm, 3mm drills, Wood saw and vice.


Method used:-

Note:- You must use a vice or make a little jig to hold the Nylon corner fixing blocks not only for safety but to maintain accuracy.

Clamped the Nylon corner fixing block in the vice then re-drill the single 4mm hole with the 8mm drill.



Make two of these drive belt / chain clamp plates.




Make the two Y slider plates from the Chopping board cut 2 pieces 75mm x 95mm.
One piece is for the X stepper motor the other for the X pulley. So for the stepper end drill out the four 3mm motor mounting holes and the central hole is drilled out to 22mm. On the pulley end X-Y slider only the central pulley hole needs to be drilled out to 8mm. The red marked holes are drilled out to 4mm. The other 8 holes are 3mm for tie wrapping the Y axis chain or belt to the slider.



Now make the four bearing assemblies using the 8 4mm machine screws 50mm long.
Each assembly is made so that the screw heads and nuts are set into the counter bores of the 4mm mounting holes.

The asembly is so simple jst look at the pictures now.

Now the x Slider rails can be hammerd with a rubber hammer into place any extra length of the slider rails must be at the pulley end not the stepper end of the assembly .




Time taken:-
Around 30 minuets or less.


X slider build

Materials :-

4 Nylon corner fixing blocks with the central hole drilled out to 8.5mm.
8 Nylon corner fixing blocks as they come.
1 ASDA / Wallmart flat chopping board cut to the drawings supplied.
2 4mm machine screws 30mm long.
4 4mm machine screws 60mm long.
4 4mm machine screws 70mm long.
12 4mm nuts.

Tools used:-
Pedestal drill, 8.5mm, 8mm, 4mm, 3mm drills, Wood saw and vice.
or
Hand held drill, 8.5mm, 8mm, 4mm, 3mm drills, Wood saw and vice.


Method used:-

Note:- You must use a vice or make a little jig to hold the Nylon corner fixing blocks not only for safety but to maintain accuracy.

Clamp the Nylon corner fixing block in the vice then re-drill the single 4mm hole with the 8.5mm drill.

Make the Extruder carriage from the Chopping board cut a piece 75mm x 87mm I have copied the universal tool mounting holes from the reprap drawings.


Make two of these drive clamp plates.



The blocks have a slight slope so they must be screwed together one one way the next the other way to cancele out the slope. The asembly of the X carridge is the same process as used for the X-Y slider



Time taken:-
Around 30 minuets or less.

5 comments:

Larry_P said...

Thanks much for posting drawings with *dimensions* ! Pictures+dimensions are easily worth more than a thousand words, and are IMHO the best way to communicate design intent to others. Especially others who don't happen to have the same CAD software as the author.

Good work!

-- Larry

BodgeIt said...

As you say you can spend a while trying to load a single drawing. Then when its loaded its was saved in inches but your CAD set up is in mm and the drawing is un useable as its huge..

May be we should have a standard for all drawings to make it possible to share drawings in the RepRap group.

It would then be easy to sepecifi a package and say go get xyz package. I have the free version of Solid edge 2D maybe some thing like that?
Or we agrre to always provide a JPG or PDF file with any CAD file.

Anyway as I can drive PSP 7 better than the CAD applications.

My drawings are not to any kind of scale though they just look as much like the finished part as i could make them.

BodgeIt said...
This comment has been removed by the author.
Jonathan said...

Hi,
I know this is a bit old but the reprap aggregation pipe keeps churning out your old posts.
I was wondering why you split the "Y axis drive clamping" part into two separate parts?
It seems to me that it would be far more rigid if they were both one piece joining the tops of the nylon corner block towers.

Cheers,
Jonathan

BodgeIt said...

I split in two to provide full access to the tool mounting plate. your sugestion of one peice making it more rigid is a good one, as having some thing there would also be useful to add a guide for semding the ABS material to the extruder.

The Darwin build will continue in Febuary 2010 or as soon as I have the solar work shops built.