[QUOTE=JAZZCNC;27876]
Quote Originally Posted by Strike CNC View Post


Ok first off PLEASE PLEASE don't under estimate the knowledge and expereince of some of the people you are speaking to here on the forum. I know exactly the weight and strength of the materials you use because I use them also.! . . BUT . . . There's a difference between material weight and mechanical stength.!
My reference to bracing had nothing to do with the material weight or choice and everything to do with the structural bracing.! . . . Which IMO at this size and proportions it's lacking.!

I agree 110% regards building the machine to do an intended job. . BUT . . in this case while YES it will fullfill the "Brief" it could have been so much better for so little more.!! . . Or better put you spoilt the broth to save a pinch more salt.!!

Given the full picture regards componets then with a bit more bracing (Esp the BED) and a REAL Z Axis then this machine could handle most jobs and materials upto Aluminium with good usable DOC.! . . .As it is now it will always be lacking.!!

My view and feelings regards machines built in this manner with these materials is that they are built purely with ease of build to extract maximum profit using off the shelf products. This often leads to comprimise, whether that be finacial or strength, they generaly lack in one or the other.!

IMO given the fact that at £3860(taking away the £600 for the enclosure) and the very fact that building this machine how you do requires very little equipment other than a decent drill press and could be built in just a few days then you are still making very good profit. Certainly enough to give a better Z axis using at least supported round rails and couple more piece's of profile for the bed.!!. . . . This would make the machine capable of so much more.!!

I wish you every success and please don't take my comments as a personal attack,.they are observations and MY OPINOINS gained from my experience building machines for my self and others and which I was invited to give (And feel should be said for the sake of others). I fully understand the need for profit being in business 0ver 25 years my self but some times saving that "Pinch of salt" really does spoil the soup IMO..!!!


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​it seems my posts are not being listed on the forum Hmm?

i did post several replies but they went to the moderators & must have to wait , in the mean time i do not underestimate your knowledge but would like to see the pictures of the machines you designed & built ,your comment regarding you can build this machine with a drill press in a few days is highlighted & to be commended but i personally would not like to receive a CNC router used for precision machining that i payed good money for made with a drill press let alone made in a few days , this would be the difference between us we do this for a living & intimately know each component & there limitations that comes with the experience gained from designing & testing machines across multiple platforms to weed out all the bugs any CNC design must go through countless revisions to fine tune the design ,first & foremost we are a engineering company with a manufacturing facility that houses CNC mills , manual bridgeport mills & large colchester lathes & this is just in the tool room used for our jigs ,we know the tensile strength of each beam & have run hundreds of tests with the various sizes over the years so we can recognise the material structural limits ,the support you speak of are directly proportionate the the integrity of the beam used & as you use extrusion you will also know there are various suppliers & one suppliers heavy grade is an other's light grade we have tried & tested extrusion from 7 of the UK suppliers & know our extrusion comes from Germany i do fear you may be thinking it is a lighter grade than it actually is.

Another point is the heiz models these use unsupported rails on all axis even at 1400mm long they also have no where near the support ours have & yet they have a great pedigree & reputation we have only got to this point by endless testing of each machine in this range & please remember we offered this customer the hiwin supported rail upgrade we can only go with the customers decision & budget there is nothing currently in this price range for this size of machine & the price is very competitive also one does have to question your motives behind this by putting down the machine whilst also trying to make a sale on this thread by supplying one of your own CNC routers to another user this speaks volumes
i do not wish to cause offence only the chance to reply
pictures of your work would be appreciated for us all to see your machine
best wishes