My 1st Hybrid Steel/Ally (1150 x 850 work area) (comments/advice please)

[Boyan Silyavski]

Thanks, will do.

Fred and I are speaking and sounds like we'll come up with a solution. Ridiculous thing is, for a set of ballscrews at $90, DHL want to charge $92 for shipping!
If we're going to find a good shipping solution between us, my costs drop to the extent I can use Servos and an alu bed.

Thats why the suggestion to buy everything from him, cause shipping costs are high, so they could be spread among all pieces. i have done the calc and seems cheaper to buy all, pay shipping, duty, than buy from Europe, where i live. 1/3rd cheaper. you will have to do your calc though. Dont forget to tell him to state lower value.

Will now go less radius as stated, but I can't quite picture what you actually mean here :).

i mean this, the green is the 300mm diameter workpiece

[lebies]

Thanks for this detailed answer, very much appreciated.

I'm not a mechanical engineer, so the best way for me to learn is by burning my fingers. To do so I guess I must expose my weaknesses but have the balls to put it out there and trust folks with experience will come to the rescue - as has been the case here (thanks all). Collectively that makes of us a better, stronger community. I look forward to when I can start contributing and in so doing free up the folks with their vast knowledge to spend more (quality) time innovating and have drones like me help newbies get going .

On to the business at hand.

Not sure you saw my revisions (we posted at around the same time) but I've made some significant changes to the original. I went back to one of my 1st designs and have decided to go all steel.



Nothing to loose and much to gain, will implement.




Done. I cut it down to even less. In fact 150mm diameter is probably more than enough for my needs.



Thanks, will do.



I'm going Hiwin 20 on everything now.



Fred and I are speaking and sounds like we'll come up with a solution. Ridiculous thing is, for a set of ballscrews at $90, DHL want to charge $92 for shipping!
If we're going to find a good shipping solution between us, my costs drop to the extent I can use Servos and an alu bed.



I'm going to buy the alu bed piece-meal over the next few months, so I'll work to it in good time and give it high priority.




Will now go less radius as stated, but I can't quite picture what you actually mean here :).




I was definitely inspired by their builds, hence the strategy on the alu bed in good time. Also, I've now got the message - go overboard on the base, it's worth it!



Thanks to Eddy (and locating his stiffness calculator) I was able to learn a whole hellova lot, and improve on my original design. Mostly though, many of the critical principles were highlighted for me to learn from and/or about.



Great! I'm going to use this combo myself. Just busy sourcing motors to match.



As stated above, once these things have been pointed out, it's easy enough to pick up on. Without Eddy's sheet (and/or knowledge thereof) I'd have been fumbling around in the dark for quite some time I can tell you. As a suggestion (very humbly), a place to put all such info in it's own right on the main board?

Thankfully there's a community of very helpful folks to nudge one in the right direction, and once you've found the proper info, you can actually do precisely what you recommend .

Thanks again for the detail, really appreciate and it'll definitely shorten my build time.

Thats why the suggestion to buy everything from him, cause shipping costs are high, so they could be spread among all pieces. i have done the calc and seems cheaper to buy all, pay shipping, duty, than buy from Europe, where i live. 1/3rd cheaper. you will have to do your calc though. Dont forget to tell him to state lower value.




i mean this, the green is the 300mm diameter workpiece

Gotcha, thanks.

Been buying all my electronics from China for a while now, so have learned a few tricks :).

I'm thinking of pairing the AM882 with 86HS35 steppers. Good match?

Not sure I should belt-drive both X-axis ballscrews from one motor, or drive each individually.
If I go belt-driven both from 1 motor, I'll go look out around here for some examples.

If I go individual drives, what size motor should I be thinking of?

[EddyCurrent]

I'm thinking of pairing the AM882 with 86HS35 steppers. Good match?
If I go individual drives, what size motor should I be thinking of?

The AM882 manual I have lists these motors as being already configured in the drive, selection being via an 8 position rotary switch.
57HS09 , 57HS13 , 57SH22 , 86HS35 , 86HS38 , 86HS45 , 86HS85
But of coarse the drive can be configured for any other motor.

Are the 86HS35 Nema34 ? you should be okay with Nema23, these are the ones I use with AM882's and have loads of power/speed. http://www.cnc4you.co.uk/index.php?r...ory&path=20_27 I'm using two of them for X axis.

This thread might be worth reading; http://www.mycncuk.com/threads/6671-...-a-good-choise

[Boyan Silyavski]

Gotcha, thanks.

Been buying all my electronics from China for a while now, so have learned a few tricks :).

I'm thinking of pairing the AM882 with 86HS35 steppers. Good match?

Not sure I should belt-drive both X-axis ballscrews from one motor, or drive each individually.
If I go belt-driven both from 1 motor, I'll go look out around here for some examples.

If I go individual drives, what size motor should I be thinking of?

No. this is nema 34 stepper . You need Nema 24 stepper 3Nm 4.2 A and look for the Low Inductance. I mean if you can not source that exact one below, which most people here use with the AM822 drivers or similar.




That in case you decide to move the gantry with 2 motors which i recommend personally. Otherwise you will need to investigate Low inductance nema 34 motor which is not easy to come by at all. In that case you can look what motor they sell at http://www.cncrouterparts.com/960-oz...tor-p-112.html. its not so easy to source such motors as one may suppose.Read more here why it matters. But may be some one here can enlighten me which China guy sell them. Its good to know.

[lebies]

No. this is nema 34 stepper . You need Nema 24 stepper 3Nm 4.2 A and look for the Low Inductance. I mean if you can not source that exact one below, which most people here use with the AM822 drivers or similar.




That in case you decide to move the gantry with 2 motors which i recommend personally. Otherwise you will need to investigate Low inductance nema 34 motor which is not easy to come by at all. In that case you can look what motor they sell at http://www.cncrouterparts.com/960-oz...tor-p-112.html. its not so easy to source such motors as one may suppose.Read more here why it matters. But may be some one here can enlighten me which China guy sell them. Its good to know.

Thanks,

Either I'll go 2 motors (NEMA23 3Nm my preference at the mo as well) but I'm also looking into going with belt & pulley on the y-axis, using 1 motor. Lots of advantages, just have to mess with different configs. i.e. these options (tensioners not included - yet):



Where 1 & 2 are single belt and 2 & 3 are 2 belts, 1 to each side from the center. I'll do the calcs and maybe present for comments.

I'm moving house at the mo, so will only really be online again in about a weeks time from Thursday.

Thanks so far for all your comments.

[EddyCurrent]

This might be worth reading, there's also a belt length calculator link in there.
http://www.mycncuk.com/threads/5146-...elt+calculator

[lebies]

This might be worth reading, there's also a belt length calculator link in there.
http://www.mycncuk.com/threads/5146-...elt+calculator

Great! Thanks Eddy.