Recommendations for Z Axis?

[samsagaz]

Hey guys, can someone please tellme some tips about how get an better Z Axis? I will start the build next week, dont know yet if use this chinese rails or wait until my new ordered HGR20 rails.

I think that will be OK the chinese ones because this machine will be used for MDF routing. and maybe made some aluminium pieces for my next build.

Here is my idea of the Z Axis.



Material is 10mm steel will try to drill it and bolt it instead welding, but not sure that can make precise drilling, dont have very good drill press.


Its the whole machine

[magicniner]

Wherever possible keep the cutter tip within the area inside the linear bearings, where that's not possible keep it as close to the area inside the linear bearings as possible.

[Boyan Silyavski]

If you would like near perfect Z axis IMHO some Very important info:

1. As said above keep the bit tip inside the gantry legs bearings step spread, side view

2. Make the design so that the rails are mounted on the moving z plate and the bearing blocks are fixed. Opposite to what you have done, not that what you have done is not valid for small Z travel.

3. Idealy bearing block spread on Z and on the bearings that move the Z left right / X/ will for same squares, or at least same rectangles, and ideally would coincide exactly on top.

4. A must for my designs is that the spindle is mounted so/ 2 brackets/ that it fortifies the front bearing plate in all positions, including fully extended / especially fully extended/

5. Use square supported rails on Z at least, best Z and X at least. Even better on all machine. 20 size.



PS. Square supported rails don't care how they are mounted. Not so with the rails you have chosen. Ideally on gantry top and bottom, left and right on Z. Your drawing uses them in their weakest positions.

[routercnc]

I know you asked about Z axis, but I would not use that design for the gantry sides. That I-beam is very weak when used like that and it will just twist the flange for loads in the Y direction.

I would plate over at least one of the sides to create a box section. You could do this by extending the existing end plate on the end of the main beam so it reaches the bottom of the I beam (lower flange) and joining them.

I-beams can be used for the gantry sides but they need to be orientated so that the flanges are pointing up/down (not fore/aft) and the central web runs inside to outside.

So in top view it would look like this:
|-|

[samsagaz]

I know you asked about Z axis, but I would not use that design for the gantry sides. That I-beam is very weak when used like that and it will just twist the flange for loads in the Y direction.

I would plate over at least one of the sides to create a box section. You could do this by extending the existing end plate on the end of the main beam so it reaches the bottom of the I beam (lower flange) and joining them.

I-beams can be used for the gantry sides but they need to be orientated so that the flanges are pointing up/down (not fore/aft) and the central web runs inside to outside.

So in top view it would look like this:
|-|

Yes i was thinking about extend the side of the gantry, but looks like changing the orientation of the I Beam will be an better choice because i can lower the height of the machine!

[samsagaz]

One more question.

I think that X Axis needs to move a lot of KGs/LBs i have 1150mm length 16mm rails and 1000mm length 20mm rails, and double and single blocks. Using the 20mm and double blocks will be an good upgrade, right? i think that the 16mm will not support very well all the heavy gantry.

Another question...

Is possible to combine double and single block support in the same rail? if use two of the doubles i need to use an base of 220mm to attach the I Bean to the Rail Block, if use an double and a single one, i will need just 180mm

Show a pics to show what i means. (my english is not good)

[samsagaz]

If you would like near perfect Z axis IMHO some Very important info:

1. As said above keep the bit tip inside the gantry legs bearings step spread, side view

2. Make the design so that the rails are mounted on the moving z plate and the bearing blocks are fixed. Opposite to what you have done, not that what you have done is not valid for small Z travel.

3. Idealy bearing block spread on Z and on the bearings that move the Z left right / X/ will for same squares, or at least same rectangles, and ideally would coincide exactly on top.

4. A must for my designs is that the spindle is mounted so/ 2 brackets/ that it fortifies the front bearing plate in all positions, including fully extended / especially fully extended/

5. Use square supported rails on Z at least, best Z and X at least. Even better on all machine. 20 size.



PS. Square supported rails don't care how they are mounted. Not so with the rails you have chosen. Ideally on gantry top and bottom, left and right on Z. Your drawing uses them in their weakest positions.

Working in a new design then! Very thanks for your time and support!

[samsagaz]

Wherever possible keep the cutter tip within the area inside the linear bearings, where that's not possible keep it as close to the area inside the linear bearings as possible.

Thanks too much! Really dont undestand 100% what it means but im re drawing and will show again in a few hours.

[samsagaz]

The hiwin rails works ok at top and bottom like the Chinese profiles? I have a new idea about the gantry. Will draw it tonight and will show you guys.

Enviado desde mi ASUS_Z00AD mediante Tapatalk

[samsagaz]

Well guys, while i wait fedex to give me my rails, i drawing a few options.

Wich think that will be more robust? Option A or B?