[Chazaxl]

Managed to get access to a bridgeport type machine to do work on the Z Axis. Almost done, need to do a fair bit of tapping and will then assemble.

[Chazaxl]

Ok, cleaned up a bit, removed the reference table, mounted the main table and did a quick test fit of the Z Axis bottom part.

The naked machine


Some bits on it



Z axis, ballscrew is just 'hanging' onto the overhang, not mounted. The Z axis needs some of the holes to be drilled all the way through and I need to find the location of the bottom carts. I did not have the measurement at hand when I machined the holes on the larger mill. As these are not threaded, I have a bit of margin for error.

[mcphill]

THANKS for the updates. You're making great progress and it looks quite impressive!!

[Chazaxl]

THANKS for the updates. You're making great progress and it looks quite impressive!!

Thanks. Wasnt sure if anyone was still interested or following this thread.

[Chazaxl]

Ive not been good at keeping this thread up to date. The UK Mycnc thread has been kept up to date.

Thor works, busy tweaking etc but some info here:-

"Suppose this means it works.



Speeds and Feeds

24000 rpm - 6mm endmill
Cutting Rate 4000mm/min
Lead / Ramp at 1440 mm/min

This was run at 80% speed. Overall happy with the cut considering there is no finish pass.

DOC is 5mm, WOC is 1.2mm

Still got more to do, but happy with the initial results.

"

[John1987]

Are you serious? After all that work you will cut with crapy chinese spindle?

[Chazaxl]

Are you serious? After all that work you will cut with crapy chinese spindle?

Yep. Feel free to send me £3000 for something better.

Ill upgrade the spindle once a)this one dies, b)cannot do what is needed, c)I have the funds available.

[Chazaxl]

Are you serious? After all that work you will cut with crapy chinese spindle?

A design constraint that you may not be aware of, is that this mill can only be powered by single phase, 32A max. This is the most powerful ****ty spindle (4KW) that fits that requirement.

Of course Id prefer a fully balanced ATC spindle.

[John1987]

Install some kind of BT 30 spindle with timing pulley and servo motor to rotate it. Much, much better choise for reasonable money.

[Chazaxl]

Install some kind of BT 30 spindle with timing pulley and servo motor to rotate it. Much, much better choise for reasonable money.

I did look at this. I couldnt find anything I was willing to part money for. The cheapest I could find was around $1500 upwards to around $4K. Servo power, I am limited to around 1.5KW (using Panasonic), however I could look at other makes.

Ill just make the best use of this spindle until I can afford an upgrade to an all in one unit.

[Chazaxl]

Are you serious? After all that work you will cut with crapy chinese spindle?

Ive bought a HSD 6.8 KW ISO 30 24K RPM spindle. Better?

[Azalin]

Amazing machine.

What are your final thoughts on concrete with super plasticiser?

Sent from my MI 5s Plus using Tapatalk

[Chazaxl]

Amazing machine.

What are your final thoughts on concrete with super plasticiser?

Sent from my MI 5s Plus using Tapatalk

Thanks. For me, it looks like a viable option. I'm not a mechanical engineer however I'm aware that some very large machines are built using similar technologies. Lafarge and other make their own proprietary UHPC - worth a look.

[Azalin]

Thanks.

Are you able to compare concrete+plasticizer with epoxy granite? On strength, vibration etc. Actually what I want to understand is how much the plasticiser makes the concrete softer and as a result how much the concrete gets flex.

[Chazaxl]

Thanks.

Are you able to compare concrete+plasticizer with epoxy granite? On strength, vibration etc. Actually what I want to understand is how much the plasticiser makes the concrete softer and as a result how much the concrete gets flex.

Nope, sorry, not within my skillset / knowledge.

[Chazaxl]

So Thor has had a bit of an upgrade / make over.

Spot the difference.

[rocketflier]

So Thor has had a bit of an upgrade / make over.

Spot the difference.

You milled a decorative 1/2 moon into your vise?

[Azalin]

You milled a decorative 1/2 moon into your vise?

Hehe

Sent from my MI 5s Plus using Tapatalk

[Chazaxl]

You milled a decorative 1/2 moon into your vise?

That was courtesy of my previous machine (Denford Triac).

Looking forward to getting the HSD 6.8KW 24K RPM spindle working 100%, hopefully this weekend I can do some test cuts. Ive only got a few toolholders / collets but will sort that out once I am confident that this works OK.

[peteeng]

Hi Chaza - How is your mill going? Any long term observations? I'm looking at doing a benchtop concrete mill. Did you use Portland cement? I'm going to use CSA cement. Regards Peter