Makerslide - is it really so special?

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potatotron
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Re: Makerslide - is it really so special?

Post by potatotron » Fri May 25, 2012 2:47 pm

jahn wrote:Look at the picture I enclosed. Seems to use STANDARD AL profiles( so even cheaper than MakerSlide) , yet also structural. What do you think about that design? I found that at YouTube
That looks interesting. Can you post a link to the whole video? Thanks.

jahn
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Re: Makerslide - is it really so special?

Post by jahn » Fri May 25, 2012 4:11 pm

@potatotron: Here it is the video you wanted
http://www.youtube.com/watch?v=BoCJFJsCXPQ
As you can see, it uses the standard profile, that is commonly sold at much cheaper price than MakerSlide (by Inventables).( at least in my country)
So it was also a reason for my question , if there is still something that MakerSlide has so that the price is also high(er ).

I also read this comment( worth reading it) at
http://www.buildlog.net/forum/viewtopic ... 258#p10973
where lovebugjunkie user says
you not even think of using the makerslide to build a cnc router and mount a large spindle on it
.

Please understand, I am not saying MakerSlide is bad, but I would like to know if it is really so good regarding price it is sold at.

potatotron
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Re: Makerslide - is it really so special?

Post by potatotron » Fri May 25, 2012 4:48 pm

jahn wrote:@potatotron: Here it is the video you wanted
http://www.youtube.com/watch?v=BoCJFJsCXPQ
As you can see, it uses the standard profile, that is commonly sold at much cheaper price than MakerSlide (by Inventables).( at least in my country)
Thanks! That's pretty clever. I just checked Home Depot and Lowe's (big US stores) and they both sell that aluminum tubing for about $10.50/meter which is only slightly less expensive than MakerSlide (but with the huge advantage that you can buy it today).

jahn
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Re: Makerslide - is it really so special?

Post by jahn » Fri May 25, 2012 5:12 pm

But so far Inventables offers 1200mm of MakerSlide at about 24.65 USD which is about half more expensive than aluminum tubing , if it is sold at about $10.50/meter as you say.

potatotron
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Re: Makerslide - is it really so special?

Post by potatotron » Fri May 25, 2012 5:59 pm

Sorry my mistake. I was looking at http://store.makerslide.com, where it is $0.011 / mm.

Either way right now you can't buy it at any price, so unfortunately it doesn't matter.....

edwardrford
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Re: Makerslide - is it really so special?

Post by edwardrford » Fri May 25, 2012 6:11 pm

My friends over at DIYLILCNC use that same extrusion in their design.

You can check out their machine here: http://diylilcnc.org/blog/verison-2-is-on-the-way/

Chris posted a couple of video tutorials on using EMC2 and a fully open source software stack, so check them out as well.

-Edward

edit: looks like their blog is down for the moment...

here's a link to their flickr set: http://www.flickr.com/photos/diylilcnc/ ... 932475568/
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

northbear
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Re: Makerslide - is it really so special?

Post by northbear » Sat May 26, 2012 3:22 am

CptanPanic wrote:I am going to scale up once I get standard one to work. I am thinking 1m square. I will also see about doing some structural analysis in Inventor once I get the inventor models from Edward.

Look like someone has done a similar exercise in Solid works

http://www.buildlog.net/forum/viewtopic ... =10#p11294

Quote from the post:
Re: Frustrating lack of information about MakerSlide specifi

Postby Patrick34 » Thu May 10, 2012 10:02 pm
Here are some theoretical numbers I have crunched and posted a while ago in the frames section. Maybe this will be helpful to you.


Re: MakerSlide, Max Usable Lengths

Postby Patrick34 » Thu Feb 09, 2012 10:39 pm
So, anyway, back to the original question...

MakerSlide Deflection: How long is the MakerSlide usable at length unsupported?

I did some theoretical analysis using Solidworks COSMOSWorks on the MakerSlide up to 2000mm in length @ 5#, 2#, and 1# loads in the center of a beam with unfixed ends (worst case). Here are the results:
Length (mm), Deflection (mm) @ 5lb
400, 0.007
600, 0.024
800, 0.057
1000, 0.11
1200, 0.191
1400, 0.303
1600, 0.452
1800, 0.644
2000, 0.883

Length (mm), Deflection (mm) @ 2lb
400, 0.003
600, 0.01
800, 0.023
1000, 0.044
1200, 0.076
1400, 0.121
1600, 0.181
1800, 0.258
2000, 0.353

Length (mm), Deflection (mm) @ 1lb
400, 0.001
600, 0.005
800, 0.011
1000, 0.022
1200, 0.038
1400, 0.061
1600, 0.09
1800, 0.129
2000, 0.177

Sorry for the mixed English(IPS) and Metric values. It was just what I happened to enter in the analysis program because I estimated the weight of the gantry to be no more than 5lb, and didn't feel like dealing with the decimal equivalent in Newtons. The unit conversions were taken into account in the calculations by the software.

Basically what this means is that the MakerSlide should not deflect more than 1mm when 5lb is in the center of a rail up to 2000mm in length.

This calculation actually would be useful for a gantry weight of up to 10lb because during by setup of the problem I had forgotten the fact that the axis requires two rails (one at each end of the gantry).

I would like to know how close these numbers are to reality.

**IMPORTANT** These values are calculated for the MakerSlide standing on edge NOT flat.**

If this is accurate, these numbers could be useful to those using the MakerSlide in other design situations.

Please add to this info as possible.
If these are accurate they seem very good for the sizes I am looking at (11"x17" working area). But the "weakest link" in the system is probably somewhere else. If I had to guess what would break first when pushing to the limits (with larger router, motor, faster cutting speeds ect) I would guess the Delrin v-wheels. Delrin is a great material with terrific wear and low noise etc, but it is still plastic and not metal and would probably deflect / deform when pushing things to the limits.

http://www.buildlog.net/forum/viewtopic ... k34#p10966
My buildlog is here

jahn
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Re: Makerslide - is it really so special?

Post by jahn » Sat May 26, 2012 7:01 am

@ northbear:
But the "weakest link" in the system is probably somewhere else. If I had to guess what would break first when pushing to the limits (with larger router, motor, faster cutting speeds ect) I would guess the Delrin v-wheels.
If you have a look at the picture I posted you can see, there is NO delrin. Only bearings and seems to work

northbear
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Re: Makerslide - is it really so special?

Post by northbear » Sat May 26, 2012 3:17 pm

jahn wrote:@ northbear:
But the "weakest link" in the system is probably somewhere else. If I had to guess what would break first when pushing to the limits (with larger router, motor, faster cutting speeds ect) I would guess the Delrin v-wheels.
If you have a look at the picture I posted you can see, there is NO delrin. Only bearings and seems to work
Sorry for any confusion, I was referring to the Makerslide system in my previous post.

From your picture I do like the all metal aspect, but it seems to only have a point contact between each bearing and the aluminium extrusion and the bearings whereas a vee bearing system (like Makerslide) has a line contact. Using the same bearings and extrusions the DIYLILCNC guys angled the bearings to have a line contact between the bearing and the extrusion. Line contact is preferable to point contact as it spreads the force across a larger area allowing for a more consistent contact and less wear over time.

http://www.flickr.com/photos/diylilcnc/ ... 932475568/
My buildlog is here

taisai
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Re: Makerslide - is it really so special?

Post by taisai » Sat May 26, 2012 4:42 pm

Makerslide is very convenient.

But the people outside US can't get makerslide easily.

I am glad if the production base spreads in the world. :D

I would like to expect OEM production in Misumi etc.

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