7' X 4' Combi

[Ricardoco]

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.

Hi Rick,

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)

I have made the pockets for the bearings 70 X 48 with a bearing size of 65 X 46, the rails are 15 x 15 and the pockets for them are 16mm where applicable. if you think that needs changing let me know, its easy to change, and i have allowed enough space in the design for this

Can I just ask what's the rectangular piece with 2 holes.? (circled green)

LOL i did wonder if anyone would ask and i didnt factor in the radiused corners in the back plate for it, I was going to tig that in to the back plate as a mount for the lower bearings for the back plate and the Y ballnut.

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.)

I had wanted it to be a single part, pocket locks gone!!

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..)

Gone!!

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...)

Done!

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.?

Yes it was to save drawing but i'm glad you have mentioned it, I will go over the design as i dont want any surprises as just the material will cost a mint so i dont want any surprises, Im determined to get this right.

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.

How much more negative would it be not to mention things, and watch me struggle when you could clearly have helped.

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..

Cheers Jazz

Updated designs will be submitted shortly..

Rick

[mocha]

snip...

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.


snip...

How much more negative would it be not to mention things, and watch me struggle when you could clearly have helped.

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..

Rick

+1 to that Rick. To me that is the best thing about all the people here who take the time and trouble to contribute. I'm not interested in fluffy platitudes, I'm interested in getting it right.

[JAZZCNC]

I have made the pockets for the bearings 70 X 48 with a bearing size of 65 X 46, the rails are 15 x 15 and the pockets for them are 16mm where applicable. if you think that needs changing let me know, its easy to change, and i have allowed enough space in the design for this

All it needs is at one side of each set of bearings to have the side of the pocket line up with the edge of the bearing, so the bearing or rail Butt's upto it.
So IE: On the Z axis have say the left bearings align with the pocket edges, same with rails on Left side. With the Y axis have the upper Bearings align with upper pocket edges, the rails you'll have to deal with on the Gantry but same applies a straight and true Register helps.
The rest of the pockets can be any size so long has the bearings and rails fit inside and infact a bit of wiggle room helps.

LOL i did wonder if anyone would ask and i didnt factor in the radiused corners in the back plate for it, I was going to tig that in to the back plate as a mount for the lower bearings for the back plate and the Y ballnut.

Ye thats what I feared.!! Don't do that it's too inflexible.! "Adjustment" "Adjustment" "Adjustment" is the secret to the whole machine and Esp the setting up of the Z axis and ball-screw alignments.
Ask anyone who's done it the difference between working and locking up is silly small and if you haven't got easy or multiple ways to adjust then life will be frustrating.!!

[Ricardoco]

Ye thats what I feared.!! Don't do that it's too inflexible.! "Adjustment" "Adjustment" "Adjustment" is the secret to the whole machine and Esp the setting up of the Z axis and ball-screw alignments.
Ask anyone who's done it the difference between working and locking up is silly small and if you haven't got easy or multiple ways to adjust then life will be frustrating.!!

Ok Will look at that, any ideas jump out at you looking at it?

[JAZZCNC]

Ok Will look at that, any ideas jump out at you looking at it?

Just make each mount individual and bolt on so that if needed they can be adjusted or shimmed has needed.! Nothing fancy needed.

[Ricardoco]

Just make each mount individual and bolt on so that if needed they can be adjusted or shimmed has needed.! Nothing fancy needed.

Yep that makes sence, off to work now so speak when i get there, will have a look when i get to site.


Rick