X axis Stiffening, simple solution increased rigidity

tklus
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X axis Stiffening, simple solution increased rigidity

Post by tklus » Sun Jan 18, 2015 12:16 am

I came up with a simple solution for joining the 2 maker slide rails for increasing the stiffness of the X axis. I found that the gap between the maker slide with the stock spacers was about .120, 1/8 aluminum is usually a little under .125, the stock I had was .122

I cut 1.5x.75x.122 spacers and drilled the maker slide as shown and bolted it all together. it has increased the rigidity greatly.
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Brian Stone
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Re: X axis Stiffening, simple solution increased rigidity

Post by Brian Stone » Sun Jan 18, 2015 1:32 am

Nice job. I took a similar approach, but instead of drilling through both pieces of makerslide to utilize the outside t-nut slots, I drilled holes to make use of the interior t-nut slots. It avoids needing to line up the two pieces of makerslide, because they can slide parallel to each other. The only real advantage is this approach is that it can be done with a hand drill, I didn't need to pull out my drill press... a disadvantage of not having a proper work bench.

I found that the gap between my X-axis pieces was 0.159", so I'm thinking that this might be different for every machine. I'm still waiting on some hardware to complete the job, but to shim the gap between the rails, I plan on using some M10 washers that I've lapped flat and then shimming the remaining distance with precision steel foil.
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clockit
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Re: X axis Stiffening, simple solution increased rigidity

Post by clockit » Sun Jan 18, 2015 5:37 am

I've seen in other threads that some are doing away with the gap/space and shortened the spacers between the endplates... I thinking about going that route and attaching them directly to each other... another thing of note, they used a common bolt for the vwheels at each corner to further decrease the flex of the x asis plates...
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WillAdams
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Re: X axis Stiffening, simple solution increased rigidity

Post by WillAdams » Sun Jan 18, 2015 1:44 pm

Neat!

Added that to the wiki: http://www.shapeoko.com/wiki/index.php/ ... g_Material

Debated on putting it on the Pants page, but worried that that will get too cluttered.
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Damin69
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Re: X axis Stiffening, simple solution increased rigidity

Post by Damin69 » Sun Jan 18, 2015 6:16 pm

Is the gap between the Makerslides required? I am looking at bolting mine together on my 1000mm span and was going to bolt them directly together. But If I do that do I need to put in narrower spacers in the Z axis assembly?
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WillAdams
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Re: X axis Stiffening, simple solution increased rigidity

Post by WillAdams » Sun Jan 18, 2015 6:28 pm

The gap is set by the spacers used. It would be nice to know what length would be needed w/ no gap.
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Damin69
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Re: X axis Stiffening, simple solution increased rigidity

Post by Damin69 » Sun Jan 18, 2015 6:39 pm

So then really all we would need to do is replace the 1" spacers from the assembly with .875" that should make up for bolting them tight together.
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WillAdams
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Re: X axis Stiffening, simple solution increased rigidity

Post by WillAdams » Sun Jan 18, 2015 7:00 pm

My rails are separated by ~ 0.16"

there doesn't seem to be a suitable C.O.T.S. part.

The difference is ~0.889mm --- is there a suitable metric part for this?

I guess we should layout the parts in CAD and work it out.

I've often wondered if it would be worth using the precision shim washers between the V- wheels and the plates.
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Damin69
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Re: X axis Stiffening, simple solution increased rigidity

Post by Damin69 » Sun Jan 18, 2015 7:15 pm

WillAdams wrote:My rails are separated by ~ 0.16"

there doesn't seem to be a suitable C.O.T.S. part.
Mine are ~.12 so seems there may be a little extra tolerance. I think I will try out he .875" spacers and drop an 1/8" off the Z Axis assembly separation.
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cvoinescu
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Re: X axis Stiffening, simple solution increased rigidity

Post by cvoinescu » Sun Jan 18, 2015 11:13 pm

Here are some dimensions that should help:
  • MakerSlide has exactly 20 mm between the center plane of the Vs and the back of the rail; in other words, two pieces of MakerSlide back to back have exactly 40 mm between the tips of the Vs.
  • The front surface of MakerSlide is in the same plane as the tips of the Vs.
  • A standard V-wheel assembly is exactly 11 mm thick. That's 5 mm for each bearing, and 1 mm for the precision washer between them.
  • M5 washers come in two thicknesses: Form A is nominally 1 mm, Form B is 0.8 mm. Actual measurements for stainless steel washers are closer to 0.95 mm and 0.75 mm, respectively.
  • If you want to put two V-wheels on one bolt and have them run on back-to-back MakerSlide, you need exactly 29 mm of space between them.
  • One 1" spacer (25.4 mm) plus three Form A washers and one Form B add up to exactly 29 mm.
  • With a single washer between the V-wheel and the plate, the plate rides half a V-wheel plus a washer, that's 6.45 mm, from the plane of the MakerSlide Vs.
  • With back-to-back MakerSlide, the distance between the inside surfaces of the two plates making up the carriage is 6.45 mm + 40 mm + 6.45 mm = 52.9 mm.
  • You can replace the washers between one set of V-wheels (say, the front ones) and the plate with Form B washers. The distance between the carriage plates reduces to 52.7 mm, which can be done as two 1" spacers and two Form A washers.
  • It's a neat coincidence that the numbers work out exactly, not just within 0.1 mm or so.
Hope this helps. It's the same approach as the eShapeoko X carriage, by the way.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

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