1200mmX900mmX170mm 4axis cnc

[Nickhofen]

I am thinking to make the base of X axe support plate 300mm, is it ok or too much?
I quess that to find the length of the ballscrew for x axis etc, I have to substract the legth of baseplate from the legth of the rail,right?

So 1200mm for Xaxis subtract 300 =900mm for balscrew plus f plus space for the end support bearings bk and bf.

[Nickhofen]

Small update.
I send an email to Fred, BST Automation, about the cost of the rails ballscrew and a VFD spindle asking for quote.
The price he offer is good but the shipping cost from China to Greece is very high ,324$

[Zeeflyboy]

I am thinking to make the base of X axe support plate 300mm, is it ok or too much?
I quess that to find the length of the ballscrew for x axis etc, I have to substract the legth of baseplate from the legth of the rail,right?

So 1200mm for Xaxis subtract 300 =900mm for balscrew plus f plus space for the end support bearings bk and bf.

300mm is more than enough.

Yes, although there is no real harm in having a slightly longer ball screw travel than the machine travel of course if it helps you in locating motors/bearing mounts. The only downside is possibly slightly more expense and a slightly lower critical speed if you get a screw longer than needed.

I was very happy with the TBI and HIWIN stuff I got from aliexpress, all machined to my own specs. Haven't used it in anger yet of course so can't fully comment but quality appears top notch, was most impressed with the ballscrew machining as it was done to an impeccable standard. The seller was this guy https://www.aliexpress.com/store/278...4b24ae2bMdgpHS although you just want to email them for a full quote rather than buy the individual parts from the store. I dealt with a guy called "John" (I doubt it lol) who was very helpful... his email was just john "at" topper-hz.com and you then pay through a special order on aliexpress so you benefit from the payment protections there.

Worth a quote perhaps. They do all the c3/c5 ground or c7 rolled.. just ask for what you need. They offer their own brand stuff too which is much cheaper but I can't comment on the quality too much... I got a couple of small c5 12mm ground ball screws and they seem ok. Not as smooth as the TBI stuff out of the box but I haven't really looked any closer at them yet as they are for a future project.

Shipping is always going to a be a bit expensive when you are shipping a lot of heavy and large items half way around the world, but if the price is good enough to begin with then that's the trade off! Shipping for me (4 x 16mm screws, 2 x 12mm screws, 2 big 25mm rails, some 20mm rails, lots of carriages and motor mounts, bearing mounts etc came to about $240 via fedex.

[Nickhofen]

300mm is more than enough.

Yes, although there is no real harm in having a slightly longer ball screw travel than the machine travel of course if it helps you in locating motors/bearing mounts. The only downside is possibly slightly more expense and a slightly lower critical speed if you get a screw longer than needed.

I was very happy with the TBI and HIWIN stuff I got from aliexpress, all machined to my own specs. Haven't used it in anger yet of course so can't fully comment but quality appears top notch, was most impressed with the ballscrew machining as it was done to an impeccable standard. The seller was this guy https://www.aliexpress.com/store/278...4b24ae2bMdgpHS although you just want to email them for a full quote rather than buy the individual parts from the store. I dealt with a guy called "John" (I doubt it lol) who was very helpful... his email was just john "at" topper-hz.com and you then pay through a special order on aliexpress so you benefit from the payment protections there.

Worth a quote perhaps. They do all the c3/c5 ground or c7 rolled.. just ask for what you need. They offer their own brand stuff too which is much cheaper but I can't comment on the quality too much... I got a couple of small c5 12mm ground ball screws and they seem ok. Not as smooth as the TBI stuff out of the box but I haven't really looked any closer at them yet as they are for a future project.

Shipping is always going to a be a bit expensive when you are shipping a lot of heavy and large items half way around the world, but if the price is good enough to begin with then that's the trade off! Shipping for me (4 x 16mm screws, 2 x 12mm screws, 2 big 25mm rails, some 20mm rails, lots of carriages and motor mounts, bearing mounts etc came to about $240 via fedex.

Thanks for the input, I will also check the store you suggest at Aliexpress.
The big problem about shipping cost is that the custom here add the shipping cost to the value of the order and then apply 24% taxes!
So the ballscrew I am going to order, lets say for the X, long axis ,is going to be 900mm plus smth, maybe 950mm?
What is the minimum the support plates legth can be, so I can have a rigid gantry?
Sorry for keep asking about something that seems obvius to some guys here but it is the first time I buld or put an order for ballscrews etc.

[Zeeflyboy]

250-300mm will give you a very solid mounting... Given it's a fairly large machine I wouldn't try to save space too much.

Size depends on what motor mounts/bearing mounts/couplings you are using. Don't just guess! Do you know what mounts and bearing arrangements you are using yet?

You may find some creative accounting on invoices.

[Nickhofen]

250-300mm will give you a very solid mounting... Given it's a fairly large machine I wouldn't try to save space too much.

Size depends on what motor mounts/bearing mounts/couplings you are using. Don't just guess! Do you know what mounts and bearing arrangements you are using yet?

You may find some creative accounting on invoices.

OK then, I will keep 300mm.
The ballscrews are those ,1605 at different length for Y and Z and for X I am going for 2020.
https://www.aliexpress.com/store/pro...5ce5139enWFCJy
As for motor mounting I am going for the typical all seller have for nema 23, for now and upgrate later.

[Nickhofen]

I am about to pull the trigger and buy the ballscrews, rails and spindle.

Carriage 2 X BLH 20-L900mm linear guideway +4pcs BLH20N Narrow Linear
Carriage 2 X BLH 20-L1200mm linear guideway +4pcs BLH20N Narrow Linear
Carriage 2 X BLH 20-L400mm linear guideway +4pcs BLH20N Narrow Linear

ballscrews Anti Backlash Ballscrew RM1610 -L900mm with SFU1610 Ballnut +BK12 BF12 Support Unit + 1610
Nut Bracket + 6.35*10mm coupler1 X Anti Backlash
Ballscrews 2x SFE 2020 Rolled Ball screw L 1200mm with SFE2020 ballnut + BK15 BF15 Ballscrew Support block + 8mm to 12mm coupler
Ballscrew RM1610 -L400mm with SFU1610 Ballnut + BK12 BF12 Support Unit + 1610 Nut Bracket + 6.35*10mm
coupler

I will use ratio at all screws to lower the screw speed for cutting aluminium.

For spindle I am going for this one:

https://www.aliexpress.com/store/pro...5bdadf47BsiI9F

for stepper motors I am going for Nema23 4NM ,this will be the next thing to order.

If anyone is willing to double check for mistakes,I will highly appreciate that.
Any opinions are welcome!

[Clive S]

The spindle you have link to seems to have 3 bearings this one has 4 http://www.ebay.co.uk/itm/2-2KW-WATE...8AAOSw-W5Us1mz

[Clive S]

I will use ratio at all screws to lower the screw speed for cutting aluminium.

Nick time for a reality check. First you appear to be using direct couplings from the motor to the screws and then you use the above statement which to me it appears you want to use a belts and pulleys .

Re the list of the screws. Not sure why you need 2010 screws. Generally the screws don't need to be as long as the rails.

Have you done a full cad drawing to show how they will fit? You are going to spend a lot of money and certainly don't want a mistake.

The 30mm you mentioned is the F length of the screw ie just the bit that the coupling or pulley will fit on.