First Build - Yet Another Alu Profile Router - 900 x 800

[Clive S]

4 qty TB6560 Drivers
24V 250W PSU

These will stunt the machine, if you can go with AM882 (not easy to find now) or https://www.ebay.co.uk/itm/2DM860H-2...-/401403682399 with a 68V power supply

[routercnc]

Agree the 24V psu and TB6560 drivers give very low performance and possibly lost steps under load.

You can hand make the large end L plates using a template and router with a carbide fluted end mill. Accuracy is not critical as the outline is mainly cosmetic and the holes can be drilled oversized. If you are fussy they can be the first things you remake with the machine.

Belt drive is often neater as the stepper can be tucked away. At 2010 you would usually 1:1 drive for wood and 2:1 ( step down) for aluminium.

Z axis should be sketched soon as the ballscrew location, ballnut, and stepper location at the end of the gantry all need to fit together. You also need to add the spindle plus a cutting bit to check the gantry is at the right height to give the range of movement you need on the Z axis plus clearance to machine over a vice.

1605 is often fine for Z but if you have bought the other size then use that.

Draw as much as you can before cutting anything because the details can catch you out !

[CaptainBarnacles]

Agree the 24V psu and TB6560 drivers give very low performance and possibly lost steps under load.

You can hand make the large end L plates using a template and router with a carbide fluted end mill. Accuracy is not critical as the outline is mainly cosmetic and the holes can be drilled oversized. If you are fussy they can be the first things you remake with the machine.

Belt drive is often neater as the stepper can be tucked away. At 2010 you would usually 1:1 drive for wood and 2:1 ( step down) for aluminium.

Z axis should be sketched soon as the ballscrew location, ballnut, and stepper location at the end of the gantry all need to fit together. You also need to add the spindle plus a cutting bit to check the gantry is at the right height to give the range of movement you need on the Z axis plus clearance to machine over a vice.

1605 is often fine for Z but if you have bought the other size then use that.

Draw as much as you can before cutting anything because the details can catch you out !

Some good points there, many thanks.

I think I am leaning towards cutting my own plates and, like you said, if I'm not entirely happy with them I'll machine replacements when I'm up and running. I normally tear through wood based projects because I am so comfortable and familiar with the material and I know how what tolerances I have to play with. Clearly working with metals is going to be a whole different ball game and I'm going to be working much more slowly, methodically and precisely (hopefully!). I'll also need to avoid errors as the raw material cost is so much higher than most woods - being a Yorkshireman I'm going to be sqeezing every last penny

I like the idea that the motors are tucked into the footprint of the frame as there's less chance of them getting knocked. I'm operating in a fairly confined space (my garage) so anything that saves space is a bonus.

Is it possible to have two sets of pulleys and belts and swap them over for specific materials? I imagine that I'll be cutting wood 95% of the time so could I run a set of 1:1 and then swap it out for a 2:1 when cutting acrylic and aluminium? Would I just need to change the parameters in my software to account for it?

Looks like I'll be on the Fusion 360 for a few days! I have only had a few hours experience of it so far and after many years of using Sketchup I am finding the learning curve pretty steep.

Thanks again for all the advice.

[CaptainBarnacles]

These will stunt the machine, if you can go with AM882 (not easy to find now) or https://www.ebay.co.uk/itm/2DM860H-2...-/401403682399 with a 68V power supply

Thanks for that, I'll take a look at those drivers and an uprated PSU. I bought the motors and drivers as a kit and just assumed that they would all work well together. At the time I bought them I did have a smaller machine in mind but you know how it goes! As per your signature; as I get deeper into this I'm starting to realise just how little I know

[Clive S]

I bought the motors and drivers as a kit and just assumed that they would all work well

Yes kits never work well, they just seem to put things together that don't match.

Have a look through Joe's thread https://www.youtube.com/watch?v=pZo2...S3i705fuSogBXT and see his build log on here.

He also has a very good vid on a power supply build.

[CaptainBarnacles]

Yes kits never work well, they just seem to put things together that don't match.

Have a look through Joe's thread https://www.youtube.com/watch?v=pZo2...S3i705fuSogBXT and see his build log on here.

He also has a very good vid on a power supply build.

I sat down last night and started watching Joe's YouTube videos, wow! Some brilliant info there, I learned a lot and got some great ideas about how to proceed with my own project. Thanks for that link, I thought I had watched every meaningful CNC video on YouTube, how I missed Joe's series I don't know.

[CaptainBarnacles]

These will stunt the machine, if you can go with AM882 (not easy to find now) or https://www.ebay.co.uk/itm/2DM860H-2...-/401403682399 with a 68V power supply

Just been looking into AM882 drivers. They offer three variations - AM882, AM882H, DMA882S. According to the details the AM882H has "fun" but the AM882 has "no fun" and it seems both are being replaced by the DMA882S. Whichever version I choose I am looking at about £200 for four drives. I can get four 2DM860 drives for about £150.

Is it worth spending the extra £50 or so for the AM882s over the 2DM860s? If I go for the AM882s, is it better to get the tried and tested AM882 or AM882H, OR do I get the latest DMA882S?

AM882 Drives:
2DM860 Drives:

[Clive S]

Just been looking into AM882 drivers. They offer three variations - AM882, AM882H, DMA882S. According to the details the AM882H has "fun" but the AM882 has "no fun" and it seems both are being replaced by the DMA882S. Whichever version I choose I am looking at about £200 for four drives. I can get four 2DM860 drives for about £150.

Is it worth spending the extra £50 or so for the AM882s over the 2DM860s? If I go for the AM882s, is it better to get the tried and tested AM882 or AM882H, OR do I get the latest DMA882S?

AM882 Drives:
2DM860 Drives:

The drive I linked to is the H version and shows : Supply voltage 30VAC (DC40V) ~ 80VAC (DC110V) this means you could just put a toroidal transformer connected to it because the drives can accept AC as well as DC

Your link shows 48-75VDC, power supply, which is a bit low for a 68V power supply.

I have used the 2DM860H several time and not had any problems

[CaptainBarnacles]

The drive I linked to is the H version and shows : Supply voltage 30VAC (DC40V) ~ 80VAC (DC110V) this means you could just put a toroidal transformer connected to it because the drives can accept AC as well as DC

Your link shows 48-75VDC, power supply, which is a bit low for a 68V power supply.

I have used the 2DM860H several time and not had any problems

Aaaahhh, I see. Thanks Clive, I'll get the 2DM860H drives that you linked to.

Cheers,
Paul.

[CaptainBarnacles]

Just before I push the button on a transformer could I just have a quick sanity check please?

Here's my thinking:

I have 4 qty 3A max steppers and I've ordered 4 qty 2DM860H drivers. I reckon that it's highly unlikely to have all four motors chugging away pulling 3A each at any given time so I've assumed 10A as the max draw. The drivers will take AC so I won't have voltage drops and capacitance calcs to take into consideration. I am looking at a toroidal transformer with 2x35V AC secondary windings in series ie 70V AC (the drivers are rated up to 80V AC). Therefor 10A * 70V = 700VA (750VA is the closest standard size).

Am I missing anything?