Milo 1.5 + Casa

[PFarm]

From my conversation on Discord.

[NewGradRN]

I see you do not have those other stuff related to triggers and M80 in there. Do your safety net popup when you boot and do you manually input M80 on the console to close the contactor? 

[NewGradRN]

Yep, I got my info from this your input at Discord

 

[NewGradRN]

One thing I missed is what's my estop.g look like... I'll check it right now.

[NewGradRN]

OK I changed my user-config with the following:

 

; user-config.g - Configure machine or user-specific overrides

M81

; Use this to set calibrated steps-per-mm

M92 X799.224886 Y798.403930 Z1595.391623

; Set motor currents (mA)

M906 X3500 Y3500 Z3500

; toolsetter.g - Configures an optional toolsetter.

; NO Type
M558 K1 P8 C"PE_7" H2 A3 S0.01 T2500 F800:400

; touchprobe.g - Configures an optional touch probe.

; NO Type
M558 K0 P5 C"PE_15" H2 A3 S0.01 T1200 F500:25

; Use this to set backlash compensation

M425 X0.00 Y0.00 Z0.00 S10

It worked... The safety net dialog box now pops up when I boot the board and the contactor closes  when I press activate.

Thanks...

 

 

[NewGradRN]

Just got back from a long extended vacation. Really missed my Milo... Anyway, got some BAP300R face mill so goes my first chips.. Nice and quiet.. air blowing but I turned off the mist.. Don't seem to need it. Went smooth from start to finish though an error showed up and did not seem to mess up the job. Trying to figure out what it is... 

This is the model I will testing various operations before I start doing some real projects.

 

Has anyone done some drilling?  I would like to know about your feed and speed. Thanks

 

[PFarm]

Welcome back!

Facing finish looks good!

Drilling with a Cobalt drill bit is possible, but the drills are going to squeal. Get some carbide bits; the biggest I've used to drill through the part is 4.2mm.

Use Deep Drilling, and I've used this pecking setting with success. This is one thing that Milo isn't very good at. Bigger hole spot drill and finish on a drill press. Spindle speed is 8000 rpm - 9000 rpm. Listen to the bit, it will complain if it doesn't like the RPM.

[NewGradRN]

Thanks, yeah that's about where I set up mine to... following Nine Mile's info I found on YouTube.

I have to try drilling with 6.8mm carbide drill for an M8-1.25 Hex Cap bolt for the modified spindle mount plate I will be cutting. I will also tryout mill threading on it. 

 

[NewGradRN]

Completed first test cuts. Not too bad I think.. except for the horizontal flats. Have to figure out to make them better.

These are the tool settings I used for this cut:

 

[NewGradRN]

I pre drilled the 6.8mm holes with #20 carbide. It squealed a bit because I could not get the mist to turn on so I just used hand spray with cutting lube on it and it seems to work. I then drilled with the 6.8mm carbide using the hand spray as well. As you noted, 0.500mm pecking seems to work best. Thanks. I'll try jacking up the speed up to 9k and see if it gets any better.

[NewGradRN]

Did more drilling test and I think I am happy with the parameters. Went ahead and tried doing mill threading and was really surprised it works real well. I found the NYC CNC's downloadable .xls mill threading calculator at Sanders Machine Works - Resources.. 

 

perfect fit for the M6-1.0 but just a tad tight on the M8-1.25 but it fits. Got the single tooth cutter from Amazon suppose to do M5-M8 but I think M6 and M8 only. 

The settings I used are as follows:

This mill sure do make a hell of a mess more so with the mist...

 

 

 

[PFarm]

Thanks for sharing the mill threading settings. I'll be honest, I've been scared to try mill threading . I'll look for the NYC site for the Excel file.

"This mill sure do make a hell of a mess more so with the mist..."

Yeah, I've been putting off using coolant for that reason.

[NewGradRN]

I was scared as well and I thought I would be breaking threading tools but.. knock on wood... Just got the serial for my Milo as well so today is a happy day.. you can find the threading calculator at the bottom of the web page..

https://saundersmachineworks.com/blogs/nyc-cnc/threadmilling-tips-tricks?srsltid=AfmBOoq0aMfsLSkvxZlr2QsH_HTRZ3G7E7pCnjXf_1vw5f7KpVNE8wT8#:~:text=Home • NYC CNC •,NYC CNC&text=Thread Mill Calculator (.xlsx),NPT Sample (.f3d)

[PFarm]

@NewGradRN Is there a way to change that Excel file to metric?

[NewGradRN]

I use an online converter from standard to metric and work out fine.

https://www.calculator.net/conversion-calculator.html

 

Conversion Calculator.webloc

[NewGradRN]

I sent message to NYC CNC if It still possible to get the metric version they said they had but no reply.

[PFarm]

@NewGradRN, I also sent an email to SWM and this is the reply I got.

 

[PFarm]

 

Here is a chart for the external metric thread. Major/Minor

Echo_Metric_Thread_Chart_2025.pdf

 

 

[NewGradRN]

Thanks, I see... good to know, now I don't have to go back and forth from calculator to converter and back... ha ha. Thanks for the external thread chart.. The challenge I know trying to figure how to do is 2 sided milling... my first project requires milling on both sides.

 

 

[PFarm]

See if this helps? 

Op2 Flip

[NewGradRN]

My Milo barely reach the end of the table going in because of the lost distance from the rail cover so I want to extend the spindle forward. I measured 40mm distance between the spindle tool center (mill thread tool mounted) and the table Y end at homed position so 12-20 forward I think is good. Got 1 of this bracket off of Amazon then split it in a half.

[NewGradRN]

So far all the Op2 I saw on videos online was facing off the hat. I'm still looking... 

[PFarm]

I like what you've designed. Mind sharing your steps for the Z plate? I'm thinking of milling these HOI.

 

[PFarm]

Maybe ask Kaddeh on Discord, I know he's pretty good at flipping a part and having the correct WCS.

[PFarm]

I know that some use a fixture plate for the flip. You mill the first side on the fixture plate, then flip it over and remount it so it sits in the same location.