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Does delrin blocks has internal thread or just a journal support?

You dont have a bearing journal for those flanged bearings do you?
I assume that your bearings located around the screw itself??

Hi sam, what is oiled sand exactly some kind of sand with epoxy?

We have 2 cnc at workshop with rotating nut & ball screw Z axis.
We are not happy with it

[QUOTE=asuratman;2188796]Is there any specific requirement to cut marble ? So you need a big spindle and expensive one ...[/QUOTE

For cutting marble you need higher speed spindle than required for...

Spindle -1ES793 - H6161H1060

Spindle -2
ES796 - H6161H0916

I think i will choose spindle-2 due to connection flange location. I can use 1 bolted plate to bottom of ram.
There fore it will be...

Good idea for Y axis ball screw location ! Noted.
to get closer to saddle center of gravity, and the tool itself.

I would like to talk about the geometry of the bridge and placement of 3...

Here are self leveling chocks and my standard leveling blocks for bed frame.

You may see rail lock and carriage lock units at every axis.

Ofcourase lead screws are less efficient in class. Only advantage is that it is self locked. Ball screws are good choice,

There will be 2 counter weight pneumatic or hydraulic cylinders located on Z axis saddle for balancing the Z axis Ram.
This will improve Z axis servo performance.

Greetings gentleman,

Here I would like to post my new welded construction 3 axis cnc router design.
X axis : 3.000 mm
Y axis : 2.200 mm
Z axis : 600 mm

It is now on design stage. ...

Well done mate impressive, masterpiece study it is.
I appreciate it. Alumina test made me surprised that I never imagibed such thing before. But it seems brittle though. Allumina is the second...

Ar-2 is Very nice project. good work really.
I downloaded 3D parts for AR-2 project but I cant open them at Autodesk Inventor.
Could you mind to share step format part files/assemble file for...

I dont have any info or feedback about the durfill and nanodour or similar type cement based casting shrinkage quantities at the moment.
And no idea how effective Shrinkage reducers (one of the main...

http://durcrete.de/wp-content/uploads/2017/02/Nanodur-Compound-5941_2017_1_GB.pdf

http://durcrete.de/wp-content/uploads/2015/06/downloads-durfill_Prospekt_E_0615.pdf

Thanks for the comment.
The young modulus to be reached 35-50 Mpa.It is easier to reach high young modulus and stregth values for polymer concrete casting rather than cement based castings

Yea you are correct about polyester resin and epoxy difference.
Agreed. If total mass is too much like this project, cost differs significantly.
Almost 10 tons of epoxy granite casting cost and...

Yes I know this build. Thanks very much for the video.This is cement based casting with very good flow quality (aggregate less then 8 or max 10mm) and packing density thnx to plasticizer anf silica...

Good comment . I will watch the video and make a comment.
Both casting creeps. Concrete based tend to more creep.
Shrinkage reducer additives come to aid.I will see how good can both be.
My...

When I visited his workshop I saw several CNC routerd with half meter Z axis. Standard cnc routers, spindle mounted on a plate moving up and down. He told me he is goin to buy a new cnc router, with...

Thanks pal, it is a good advice. At the begining I was going to use bellows only for ball screws but i will use wide "U" shape accordion type fabric bellows all over the screw and rails.
Telescopic...

http://www.cnczone.com/forums/attachment.php?attachmentid=362906&stc=1

Preliminary design Hybrid Construction.

http://www.cnczone.com/forums/attachment.php?attachmentid=362904&stc=1

X axis horizontal columns are preliminary drawn (only the boundaries) yet in this picture.
There will be 2 horizontol...

http://www.cnczone.com/forums/attachment.php?attachmentid=362900&stc=1

Welded footing with internal ribs : 900 kg (St 37)
(Mass could be reduced by using St52-3)

...

Dear All,
I am up to a vertical CNC project to one of my friend for 3 months.
This is something serious project.I have designed very big machines before around 140 tons-300 tons and several high...