CNC Router V1.0 (For Cutting Multiple Materials)

**biketrialsdave** · 17-11-2015

Booked tomorrow off work so hoping to spend some time on this now I've got some other projects out the way.

I've been looking at stepper drivers too. Think I'm going with the AM882/EM806. It looks like Aliexpress is the place to get them, just need to find a "reputable" seller... On the subject of buyign things, I can't seem to find the bloke in China who was the go to person for ballscrews etc? His eBay shop was something like "linearmotionbearings2008" ???

**Clive S** · 17-11-2015

You could also try Fred at BST http://es.aliexpress.com/store/314742 email him direct for the best price

Chia website is http://stores.ebay.com/linearmotionbearings

**JAZZCNC** · 17-11-2015

Go with BST slightly better quality and great to deal with.

**biketrialsdave** · 18-11-2015

Thanks guys!

Quick question (I'll post an update later)....I'm going for HTD 5mm pitch pulleys (as suggested), what ratio should I start with for x and y axis? Also, I assume I want a larger diameter pulley for more teeth/belt contact as opposed to a smaller one?

**JAZZCNC** · 18-11-2015

Originally Posted by biketrialsdave

Thanks guys!

Quick question (I'll post an update later)....I'm going for HTD 5mm pitch pulleys (as suggested), what ratio should I start with for x and y axis? Also, I assume I want a larger diameter pulley for more teeth/belt contact as opposed to a smaller one?

If using typical router setup with 10mm pitch screws and steppers then you don't have a ratio so it's 1:1.
Common pulley size is 20T. Don't go too small because there's not enough teeth engaged. Don't go too large because you increase screw inertia which affects acceleration and power required.

The main reason for using pulleys is to lessen resonance which affects steppers. The abilty to apply a ratio is just a bonus.
One advantage if usng say 10mm pitch is that you could apply 2:1 ratio and increase torque and resolution if ever required. Or go other way and apply ratio if you ever needed more speed but with 10mm pitch you won't anyway thats why 1:1 ratio is often used.

Same with Z axis keep 1:1 ratio but use a 5mm pitch screw for better resolution/torque.