Thread: 7' X 4' Combi
31-12-2012 #11Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
if this works, you know you are making me one of these when i expand my empire. :D
btw why did you go for a weird size like 7' x 4' instead of 8' x 4' which would let you fit a full size sheet of anything?
The size? Hmmmm, i only needed 6' X 4' but you lose about 8" or more from the tool to the back of the gantry, so 7' covers what i need but is still considerably cheaper than going to the 8'. To actually have an 8' X 4' usable area can mean a machine of upto 9'..
Maybe iI will do a Full 8' X 4' usable area when ive comleted this One.. He He He..
RickAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
Only one question; how do you plan to lubricate the ball-screw that rides inside of Z? having run into this issue myself, I though it wise to point it out. One option is to machine a port into the plate and have the zerk (grease) nipple come out through it to the front and thereby save yourself from having any future issues with greasing the ball nut (not something that has to be done often but trust me not fun to do with having to remove half the Z to get at things. Other then that great design and keep on with what looks to be a wonderful build.
02-01-2013 #15Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
See Little things but important and worth the little extra effort.!
First the linear rails and bearing pockets. Ideally you want registers to aid alignment/re-assembly and because your pocketing the bearings you can use the walls of these pockets has the registers by making sure the bearings on one side of each set of bearings aliagn with the walls (See Red circles in pics).
Also I'm sure this you know but I'll point out any way just in case.? The pockets have square corners and we can't easily machine sq corners. So the pockets will need additional length to allow for the radius of the cutter. (circled Blue)
Can I just ask what's the rectangular piece with 2 holes.? (circled green)
The top stepper bracket.? Is it a 2 piece part or single.? Doesn't really need to be 2 piece and could be single and still do the job. Also the little bits that lock into the pockets won't be needed and make the machining and fit harder than needs to be Again due to radius corners clashing with square edges.
To be honest all the pockets and step down on top piece could also be done away with and reduce machine time without adding a massive amount of weight. Lot of work in that one piece that doesn't need or had much to the machine.
The I'd also leave a small skin 1-2mm on the lightening pockets on rear plate so it doesn't leave access for flying chips.
I know it's just probably to save drawing but remember all internal corners will have radius so take care this doesn't catch you out if anything is close on dimensions or catching.?
Edit: Oh Before those observing think I'm being negative or putting someones work down which to be honest I'm getting sick being accused off then Ric asked me to have a look and comment.
One other thing I don't see any reference to a ballscrew or bearing mountings for one.?
The slot up the centre looks rather narrow for Ballnut and it's mount has well.?
Firstly Jazz and i must say this at the begining and not the end, I dont want replies that are skirting round what im after, for fear of offending me, Im a grown man and i dont have time to waste, I like the direct responces and if i factor in a bit of northern sence of humour, i get a free grin to boot!!!
I also respect all those people who know better than me and dont see the comments as a personal dig, If i cannot do something because i lack Knowlege, experience, or indeed a little common sence, then its nice to know that there are those that will give replies i wont forget in a hurry LOL and i get their wisdom for FREE.
This is a free forum and if i get a bit of banter, well thats a small price to pay!! (and im free to give it back)
So many people read emotion into text that isnt there, I dont want you to stop being critical of any designs i submit, it will save me finding out the hard way..
Updated designs will be submitted shortly..