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Hypercube evolution 12mm XY modification

by sverreb Aug 10, 2017
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Thanks for this, building a big HEVO that most likely will use 12mm rods for all axis. I'm just wondering which holders you use for your mechanical endstops? As I have the optical endstops. Thanks!

I am printing your mod at this very moment! Only I have to modify all the bearing holes since I am going to use the cheaper and smaller straight bushings...

The material for my HEVO is already here but one other thought for future builders: I think it should be possible to just use the 12mm mod as it is with 21mm O.D. Igus straight bushings and 20mm!! CF tubing for the X axis... There is no 21mm Iglidur J bushing but they make an Iglidur G straight bushing that fits the bill and should work fine on the CF too. Part number is GSM-2021-20.

To use 20mm OD X rods the XY joiners will need a redesign as the current design can't accommodate that large rods without changing the rod pitch. Also be aware that increasing the Z dimension of the XY joiners will move things around in the frame a bit as there is not much clearance with the current design.

Thanks for making this adjustment to the HEVO.

I was looking for this solution as i couldn't imagine that no one actually thought about using 12x2mm aluminium rods on X (they're as stiff as 8mm solid steel but WAY lighter) and still keeping the steel 12mm on Y. IIrc 8mm steel is ~400g/m and 12x2mm aluminium weights ~170g/m. That's less than half the weight while maintaining the stiffness of the steel rod. NICE! :)

Where did you find those mechanical endstops? I cant find anything the resembles that size on amazon or ebay. Either I find the stops are mounted on pcb boards or they are much smaller in size like the ones I have on my prusa. Some of the larger ones like yours that I did find have the holes positioned diagonal.

They are honeywell zw50 switches. ZW50F92AW3 I believe

How are the 12mm carbon fiber rods working on your x carriage compared to the stock 8mm steel rod setup? I am assuming you used igus CF rods? Also, is it mandatory to get rid of the stock optical end stop setup because of this configuration or was it just a personal choice?

The 12mm CF rods work very well. I can run jerk at over 60mm/s without any apparent artifacts (But it is hard on the mechanics so I generally limit it a bit)

Dropping the optical endstops was a matter of preference as I think the flags are a bit on the fragile side. In retrospect the X-carriage/effector is cramped enough as it is. If I should have designed in an optical endstop as well it would have added even more complication. I don't really see any issue with the mechanical stops.

Just ordered 12mm hollow alum rods and 12mm bearings from Igus. CF was too expensive for this go around. My quote for CF rods on the x axis were like $90 a piece. Maybe ill upgrade to CF next time. Printing all the parts now. I should have my new build done by end of next week.

What is the outer diameter of your y-axis lm12uu bearings? The y carriage body does not fit the ones I have. I bought new ones with same result.

The Y axis use LM12LUU with an OD of 21mm

Ahh that would explain it. The two sets I bought were 22mm OD. Is the x-carriage also 21mm?

No the x carriage use LME12UU which are 22mm OD

This might seem odd, but thre reason is that the IGUS bearings was more readily available in LME12UU form factor, while normal steel bearing was more available in LM12UU form factor. As I use carbon fiber on X I needed the IGUS there, but not on Y.

Great, I like this idea.
From an old project I have some profiles with 45x45mm.
Do you have the CAD file to modify these parts by my own.

Edit: I found the Fusion files. Thx.

I do have cad files from fusion uploaded. Take a look at those and let me know if you need something else.

Hello, do you have the CAD file to modify to 2525 frame?

I have uploaded fusion 360 export files. I haven't used this flow before though so let me know if something is missing.

Thanks for making this!