Good news, @DiggerJ . FYI I am looking to install bearings and flex couplers on both ends for parallel driven steppers. Have not ruled out dual NEMA 17, but thinking NEMA 23 to support further growth in size while retaining speed. I still need to review some engineering parameters to make certain it will have some life and reliability. If you wind up with a solution that is an existing drop in, I'm in for at leasts one set. Cheers......

 

I'm cautiously optimistic!

 

So I read the current extruder needed some love and I found:
http://www.thingiverse.com/thing:501755

I like everything about it except that it doesnt fit out x carriage. So... I changed it to fit it Dunno why the current carriage has 4 mounting holes, but extruder only used 2, so I made use of the other 2 mounts as well.

I haven't tried it yet since I dont have my vslots!! But someone else might want to. I've include the sketchup file in case I messed up...

Cheers!

 

OK guys. I have info on the screws and nuts, but need to know if these will work.
The 12mm x 25mm travel, 5 start nuts are available flanged in regular and anti-backlash. Here are the spec sheets on both. Will these work? Comments?

 

I would look at the anti-backlash myself , it will last longer when it comes to accuracy

 

Prices for the anti-backlash are about $50 each plus shipping and the standard are about $25 each plus shipping.
The screws are about $25 each with machined ends, in quantities of 10 or more, plus shipping. Prices on 1-4 are about $45 each plus shipping. There is a $100 minimum if you set up to buy from them direct.

I am considering buying 10 screws and dividing them out so we can get the max discount. This is way under Trinity's price before they closed their doors.

Anyone want to buy in with me?

 

Hi DiggerJ, I like the price but my question is if they are equivalent to those of 10 starts. Are they much slower ? Is it possible to send them to Spain ? thanks!

 

I am no expert on the speed. They both move 25mm in one revolution if I understand it, but not sure. It is the only 12/25 multistarts that I have found in the States, so far.

 

I am looking to build a printer and this one seems like a good idea - to get rid of the belts. I have 2 Deltas now so I can print up the brackets myself easily. I would be interested in buying into this. It seems kinda important. Is every this else available from openbuilds? I was going to use the motors and electronics from one of the deltas.

 

Yes I would be looking for a set of anti-backlash myself

 

@DiggerJ Put me down for a set if you are getting more than one set of screw/nut assemblies in the near term. Thanks

 

I am going to order 10 screws. I have these people as wanting a set:
Me
Robert Hummel
Holy1
David Davis

I need to get measurements for the ends taken so I can order them. I plan on measuring the length using the OBstore NEMA 17 measurements.

The nut types will need to be determined for all, and the order can be sent. They have a 10 day lead time to ship.
I just started a new job, but I will put the stuff on my CC to get started. You can pay me via Paypal, I think.

If nobody else in the States wants the 5th set, I will keep them. I am considering a 2nd machine to potentially donate to a makerspace here.

 

Hi , I'm also interested in the anti-backslash version with maschined ends for x and y axis.
Do you ship to Germany?

Best regards,
Florian

 

I generically spec'd 500mm for the quote, but need to give them the exact measurement for the order, as well as the size and length of the turned down machined ends. The bearing side will be 5mm, but have to check the coupler end. the NEMA 17 motor shaft is also 5mm.

 

I have never checked to see what is involved with shipping to another country, but we can look it up.
As long as everyone pays for the costs of their order (shipping and pckging included) my plans are to pass it through at my raw cost.

 

Sorry, I missed your post. They should both move 25mm up the shaft with each turn of the screw. As far as shipping, I will have to check on over seas shipping as I have never done it. Maybe Robert can give me some pointers.

 

International shipping tends to be double the rate of shipping within the US and Canada.
Always get tracking!

Labelling as a gift saves on duty and low value also helps the receiver / dentures theft with heavy packages

 

Okay, that's okay for me. Just tell me/us what it would cost with shipping and packaging.
Is there a need to modify the x or y carriage because of this screws?

Best regards,
Florian

 

The shaft diameter overall is the same as the original. My plan is to take the original build detail lengths for the extrusions and subtract the thickness of the plastic on the bearing end, and subtract the length of the stepper motor on the other end, and that should give me the max overall length.

From that, I can measure the thickness of the 2 bearings and shims on the bearing end and know the length of the machined end for the bearing end. 1/2 the length of the coupler plus 5mm should get me the machined length of the driven end.

From that, I should have the 3 pieces of info needed for final shaft machining. Then add the nuts to the order and we should be good to go.

You guys look this over and tell me if you think I missed anything. I haven't looked at the dimendions of the nuts to make sure they will fit in the printed plastic oieces of the X axis and the Y carriage. Guess I better look at that.

 

Ok, I am in Canada . Not sure if that is an issue. Thanks for doing this.

 

Robert is also in "Canuckistan", and his shipments to me always arrive, so I think we can get it to you.

 

When are you planning on placing the order? I may be in depending on the expected order date. I would need screws that are 21.2" full length so I can use the 500mm extrusions and the threaded rod plates in the OB store.

 

Honestly, my goal was to determine the need and satisfy my desire to build the Lautr3k. I will try to work this to help keep costs down for us builders. My personal thoughts are that if it is popular, perhaps we should ask that the OB Store add the parts to their store. Lets see how the first run goes and we can go from there. I am not in a big hurry to compete with the OB Store, because I really support what they do for us.

 

Hey Tim, are you building a Lautr3k or something else? It doesn't use the threaded rod plates or that length screw in the original plans. I only have prices for the one length screw. My plans are to hopefully order this week yet.

 

Hey There!

Count me in for a set! Just let me know the PayPal info!!!

 

Hi,
this should be the drawing of the original lead screw for x & y.
Hope this helps determining the length.



Best regards,
Florian

 

Where did you find that image? I would think the Y axis should be longer, but if that works for both, that solves some time issues. The Y space starts with 480mm, and is reduced by the thickness of the plastic bearing socket on one end, and the length of the NEMA 17 body and shaft on the other. Didn't seem right that those 2 deductions could equal 106.9mm. But I quess id doesn't have to be full length.

So the flex coupler used would be 1/4" to 5mm, right? If so, I have what I need to know if everyone wants the Anti-backlash nuts over the standard acetal nuts.

Thanks for the drawing. I am guessing that there is info somewhere I haven't found. I read the build on OB again last night, and scannned for an image on the build manual.

Is everyone good with the measurements Florian gave?

 

I'm happy with that but would rather both machined ends to be 5mm so I may use OB bearings in the supported ends.
With both ends supported higher speeds can be achieved with less whip in the leadscrew