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08-08-2013 #13
Wow - shocking stuff re STRIKECNC! The worst part of all that is that CNC for me is fun and hugely rewarding and you can turn creativity into realism and that sort of bad press puts a sour taste in peoples mouth. You should not have to "modify a machine under warranty" the machine should work. I can't believe so many sales happened as they did... Really bad press for CNC and I'm very sad to hear as such... I do hope that my initial impression does not lead to any such equivalent opinions!
Apologies for incessant typingBut we have seen machines come in with slap in the ballscrew housings that negates any of the advantages that the ballscrews can deliver in the first place. Sometimes you really have to wonder...?
This is an interesting point and one which I have some experience with through my time at University - my first comment is that self excited machine vibration / chatter is not good and causes havoc with the cutting results as well as with the machine and should be avoided like the plague at all costs - and chatter is down to the machine frame dynamics, the cutter and the tool path parameters.. However chatter aside - the level of vibration from a spindle during cutting especially is significant and as you know the vibration level is the square of the rotational speed which does not help our cause as CNCists.
Our machines come with rubber feet with height adjustment. The rubber feet dampen out the hummmmmm associated with a rotational vibration excitation being transmitted through (and in some cases amplified by) the machine structure into the table. For sure the hummm can then be transmitted back to the control bay and cause fatigue/terminal issues long term however the levels of vibration are relatively low in our case. The digital leadshine drives to my knowledge have midband resonance damping so the steppers run smooth and so do the drive systems - minimal vibration levels contributed there. The ER20 collets on the high speed spindles we use run very true with little run-out minimising the eccentric mass levels during rotation minimising vibration levels.
The control electronics are mounted onto a plate that is secured to the base of the box section frame on the opposite side of the machining table. Therefore there is the Tslot bed and the 80mm x 50mm frame bed acting as a mechanical filter between cutting and the control bay. Again with that said I could put an accelerometer on the machine and see what the actual acceleration levels generated are. The machine has been in production with us for almost two years with no issues to date. To memory the BOB is mounted on rubber standoffs and has a ribbon cable between the LPT output and the machine frame - I'll check it out. The leadshines are bolted to the Al plate - again I'll give more deets with pics early next week.
Long term I'm also a fan of the soldering Iron. Time yes - but worth it!!!
Haha! a very honest response. may not be worth the effort in that case.. interesting
Many thanks for your positive words. I got into CNC as I love the freedom of being able to turn ideas into reality and was always frustrated at University as the machines were the technicians territory. There was a serious disconnect between the eejit doing the CAD drawings and the eeejit machining the bits..
We would like to contribute positively to this area as I feel there is a "make it movement" occurring. We need to start making things again and we can't make stuff - or even begin to makes stuff with CNC tools - if there are not affordable machines that can actually do some commercial work and get people into it.
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