Help Please for Moving Gantry

[routercnc]

Hi Endlasuresh,

You are only getting answers to some of your questions because what you want to do is not the usual DIY machine.

The requirements of your machine are to be able to machine tool steel (?) to create accurate dies for a plastic injection molding machine. I assume on a fairly regular / daily basis as part of a small business. This is quite an ask for a simple DIY machine and is one of the reasons you are not get a direct answer.

So, lets put it another way. No-one is going to give you plans or CAD drawings for a machine ready for you to put it together and start machining.
Instead, if I was doing what you were doing I would look at how the commercial machines go about doing it, ask yourself why they did that, and design in some of those features as best you can. For example, here is the inside of a Mori Seki machining centre with a moving gantry.





If you go to their website it will most likely tell you the interior cutting area and from that you can approximate the scale of the ballscrews (I would estimate at least 20 mm) and linear profile rails (estimate at least 25 mm possible larger), aligned to a reference edge and stiffened using side load 'fingers', with cast main assemblies, and a very powerful spindle, plus servos motors to drive it all. Given you started looking at machines in 2010 these sorts of features should be familiar to you.

Alternatively there you can convert a reasonably sized milling machine to CNC / buy an aftermarket kit for a milling machine. This gives you a fixed head and moving table.

Hope this helps you decide what to do - I don't think anyone on this forum is 'holding out on you' if that is the sub-text of your posts.