8X4 router build advice if possible for a total novice please?

**Newventures** · 16-04-2020

If I could get anything like half as good as that I'd be very pleased!! that's also put one thing to rest in my mind......I was unsure if I dare ask about using Ally for the gantry construction for a 4' width table but quite obviously its more than up to the job!!!

Hopefully the man himself will be along to offer help and advice over the next few days, I've seen plenty of his help and comments, great sense of humour too!!

Thanks Clive

I've had a search and read through some build logs but can find very few 8x4 machine builds......there was one I found but it never got past making the steel frame unfortunately

**JAZZCNC** · 16-04-2020

Originally Posted by Newventures

Hopefully the man himself will be along to offer help and advice over the next few days, I've seen plenty of his help and comments, great sense of humour too!!

I'm here watching, just staying quite to tease you....

. . .I'll be back later.

**Newventures** · 16-04-2020

Originally Posted by JAZZCNC

I'm here watching, just staying quite to tease you....

. . .I'll be back later.

I'm building site background and moved into trucking so sense of humour is something I'm very well known for and like so tease away

**JAZZCNC** · 16-04-2020

Ok I'm back n here goes.!!

Originally Posted by Newventures

I've had a search and read through some build logs but can find very few 8x4 machine builds......there was one I found but it never got past making the steel frame, unfortunately

Straight off the bat there's a good reason for this.? It's a common mistake that new builders assume that if you can build a small machine then a larger one can't be much harder.!. .Surely it's just a scaled-up small machine.?

Well Yes and No.! Yes in basic design terms then it's very similar but that's about where it ends, Everything else is different.

Frame building is more difficult because any errors are magnified so it needs much more care when welding and better measuring, alignment equipment which most people don't own. It's also not cheap or easily found. This is why they often fall at the first hurdle and end up with bent n twisted frames.

Then the design needs to account for the length so the selection of linear drive components and type is massively important.
This is usually then next fence they fall at because they choose the wrong type or made a poor job of implementing it into the design. So they end up with binding and sticking axis which is from the combined frame errors and poor implementation or component choice. The problem is they usually don't know this yet or if they do they don't realize the effect it's going to have.?

Next, come the motors and drives. If they get this far.!
Because of the twisted frame and the binding axis, they require more push. However often they buy motors or drives that are either only just suitable if the frame and linear movement side was perfect or as is usually the case they undersized them or if lucky they have very little overhead for error.

So when they get to this phase and find that there baby which they expected to fly struggles to even crawl they often chop the things into 3 pieces and build a smaller machine.!! (When they stop rocking and come out of the corner.!!)

Now that doesn't mean it's not Do-able but it does mean you have to go into this with eyes WIDE open and I won't bull shit you. It's not something I'd advise a first time builder to attempt unless they have a lot of patience with a good workshop and knowledge of using the tools.
Even then they will need to do a lot of research and fully understand why they are choosing the design they have or the components they decide to use.

If you want to chat about it I'm more than happy to give you my details and speak to you or coach you thru building if you like. However, there's far too much to be posting on here in any detail but I'm happy to advise thru the forum if you want to start a build thread, you just won't get all the juicy details...

Building a great machine is very possible but it's hard work and not something that can be done on the cheap. How much depends on how far you want to take regards components and like you say how long is a piece of string without deciding on a spec.! . . But expect at a minimum £5k for basic machine and £10k for a higher spec with servos and ATC etc.

PM me if you want to speak.