Luke11CNC Build Log ,I'm so naïve

[luke11cnc]

Jonathan I think it's just you

all look's Ok to me

Those parts look really good big thank you see you Saturday I can't wait to start fitting parts to the CNC next Sunday

Luke has sprained his wrist and got it all strapped up (playing Rugby) we had to take him for a X-ray last night Bless him

well the computer is in the workshop and all working ok, how ever I spent all day trying to find a video controller driver as the one with my xp didn't load.It's a good job I have a toggle or what ever it's call

James

[Jonathan]

Jazz - are those feeds/speeds on your CNC router or milling machine?
I'm using 12600rpm as that's what it sounded best at. I added a little cutting fluid into the slot every so often.

Luke has sprained his wrist and got it all strapped up (playing Rugby) we had to take him for a X-ray last night Bless him

That's why I always did anything I could to avoid playing Rugby! Hope he gets better soon...

[JAZZCNC]

Jazz - are those feeds/speeds on your CNC router or milling machine?
I'm using 12600rpm as that's what it sounded best at. I added a little cutting fluid into the slot every so often.

On my CNC machine, I don't have a mill.

I used to cut squirting with Industrial WD40 type stuff called workmate 40(WM40. .:naughty:) that I have manufactured and sell in my day job.
This was ok but has the negative affect (like you'll know) of making the chips stick and clog the slot rather than fly away. . . this has 2 negative affect's.(Other than fumes)
1: The heat doesn't leave with the chip.
2: The fluid heats because it's not flooded away so just sits there boiling.
Both together heat the Ali so the chips are warm before the cutter actually cut's, on cheap Ali or if too hot can cause sticky bits or chips which weld them selfs onto cutters.

The best by far is blown air because it keeps all the slot clear and blows the chips away from in front of the cutters path. Thou like I say messy as hell with chips blown all over the place. . . . There's a 10feet perimeter round my machine that looks like it's rained glitter when doing big job's.:lol:

Tried using a mister but I couldn't breath so soon knocked that in the head.

At the minute I've just got 3 simple coolant nozzels connected to regulator pointed at the cutter blasting away all in it's path (Got big compressor)

When I get time(So never) I'm going to make Ali ring sandwich with 8 short directional squirt nozzles, 4 will be air, 4 coolant that fasten to the base of the spindle (Maybe put in some Led's for light as well) then with selonoid's control both with Mach3.
Air will be constant but turned on off by Mach and coolant will squirt every so often just enough to stop sticking but not fume me out the shop like mister.


James: If you think rugby is bad for broken bones try MotoX, I've been in just about every A&E with either my son or me in the hot seat. .:lmao:

[Jonathan]

You've just described exactly all of the things I've tried (except mister, not tried that) and the same effects!
I agree compressed air is great. So far I've done that just by holding the air gun close and following it which works reasonably well. The main problem is heat getting into the part I am machining - as soon as that gets hot say bye bye to the finish/cutter. Compressed air doesn't seem to be effective in that situation, you need liquid cooling. On the parts I just posted this wasn't an issue as they were cut from a 12"x3/4"x2000mm bar which nicely conducted the heat away.

One day I'll attach hoses for coolant and air...

It depends a lot on the grade of the aluminium...6061 is the best I've used so far.

Going to buy some more 6mm 1fl cutters now.

[JAZZCNC]

Completely agree agreesive flood coolant is best by far and my next SUPER HD MILL (For diy anyway) will have full "drown if you stand still" coolant and enough air to blow the knickers off a Nun at 50yards.:whistling:

The next best thing I've found for ALi is air but lots of it, don't need high pressure just plenty of volume. . . .This and playing with the chipload/RPM and I tend to find the happy medium.

Best alloy cut so far small amount 7075-T6 for some motor bike engine covers very expensive stuff and scrounged from a mate. . Wish I could get some more.!!

Worst stuff some really crappy 5 series that was like cutting string cheese. . . Night mare.

Anyway I'm off to watch F1 Grandprix on Iplayer been away MotoX-ing all day so missed it. . . . . Don't even think of telling me who won because I'm not returning after posting this. .:rofl:

[Jonathan]

Completely agree agreesive flood coolant is best by far and my next SUPER HD MILL (For diy anyway) will have full "drown if you stand still" coolant and enough air to blow the knickers off a Nun at 50yards.:whistling:

LOL

I think the extrusion you've mounted the ballscrew and rail for X on is 45mm tall? The centre height of the BK/BF block on ballscrew is 25mm, you've said 30mm for the ballnut blocks and the SBR25 rails are 60mm total height. So distance between mounting plate for linear bearings and ballnut block is 30+25+45+60=160mm. That makes the distance between hole centers, with 3/4" thick aluminium 160+19.05=179.05mm. Call it 179mm...
The distance between the mounting holes for linear bearings and ballnut mount plate on the gantry sides I just made is 180mm, shall I make the ballnut blocks 31mm centre height to compensate? I know the sides are slotted so it would still work, but still nicer to have it correct to start with?

Edit: reading that again makes me think it's probably negligible