Lionkev's Aluminum Attempts

New Home Forum Mostly Printed CNC – MPCNC Advice – MPCNC Lionkev's Aluminum Attempts

This topic contains 103 replies, has 10 voices, and was last updated by  Kevin Lopez 1 year, 8 months ago.

Viewing 14 posts - 91 through 104 (of 104 total)
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  • #39597

    Kevin Lopez
    Participant

    I think I am going to go with this http://www.ebay.com/itm/Mist-Coolant-Lubrication-Spray-System-Unit-for-CNC-Lathe-Metal-Milling-Machine-/311768128985?hash=item4896d41dd9:g:9lMAAOSwf-VWYj6x
    and http://www.homedepot.com/p/Husky-4-Gal-Portable-Electric-Powered-Air-Compressor-BS1004W/206480997

    Seems like enough air to me, I really am not dishing out the next satellite to go to the moon. The mister is made for coolant but my guess is it doesn’t really need it. I just like how it has the line already there and has a valve.

    #39598

    Jeffeb3
    Participant

    You can get a lot of tools used on CL, too. I didn’t have luck with a compressor, but I bought my drill press on CL and I got a bargain. Tools that are designed for people working 40 hours/week won’t get worn out by weekend warriors, usually. And a lot of tool tech hasn’t changed much in the last 20 years.

    #39599

    Kevin Lopez
    Participant

    Funny you mention that, cause I was just looking. For bigger stuff that is usually more expensive online (shipping cost), I find letgo to be good. Craigslist is good too but there’s all these newer options too like wallapop and offerup. Found a compressor for $40, may take a stab at it.

    #39608

    Jeffeb3
    Participant

    Maybe that’s why I’ve had trouble with Craigslist last time I tried to sell something…

    #39751

    Barry
    Participant

    Playing around with aluminum again.
    https://goo.gl/photos/GEF1Pr4og7VEd7rb7
    Drop down to the last four rows of pictures. I shortened the mpcnc back to my first dimensions. Have about 510 by 470mm of cutting area. After surfacing the spoil board I tried cutting some 2″ aluminum bar. Didn’t work out so well. So I attached a second piece of mdf on top of the first piece, and attached a half inch piece of plywood to that. Then I did the masking tape and superglue method of attaching the aluminum to the plywood. Much better results! End goal is to mill out some name plates for my ladders at work.

    #39892

    Ryan
    Keymaster

    Is that climb or conventional? 6061?

    #39895

    Kevin Lopez
    Participant

    Hate to just barge in on the answer but it looks like conventional. Climb almost always works better, the only downside is your bits can grab into the material and break your bit if you don’t have things really perfectly aligned. I’ve had it happen 🙁

    #40029

    Kevin Lopez
    Participant

    Little update, I have been doing not as many cuts recently, selling junk on ebay to buy the new air blast system. I wish I could go with a mister with some coolant, but my bed being particle board, aka a sponge, I would like to keep it dry. Picture is one of the motor mounts, before the width of the cut exceeded the stock and hell broke lose. My fault entirely, need more stock asap! Buying stock online bugs me knowing that I am paying an extra 35% just to ship it to me.

    Squared everything all over again and my results are coming out fantastic. Once I get the air blast, I have full confidence in the mpcnc. As of now I have to follow the bit at all times with the shop vac or the chips build up in the slots really quick. It’s kind of cool, the chips form a fuzzy texture in a pile. They’re really nice chips though, like a small version of the ones you see in those youtube machining compilations.

    To anyone else trying aluminum, always CLIMB mill! On the finish and on roughing. Conventional isn’t better at doing anything. The only time it doesn’t matter is during slotting.

    Attachments:
    #41278

    Kevin Lopez
    Participant

    Finished setting up the air blast today, maybe needs a little cable management. I went with a Husky 4gal from Home Depot. 3.7SCFM @ 40psi. Everything used was like a 30 minute drive. Plus no warranty.

    The air nozzle I got is sort of junk, but for $8 I wasen’t expecting much. The air leaks through seams in the flexible portion of the hose, which wastes pressure. It is made for coolant to be run through it as well. Might run coolant one day but=that is a little overkill for now. I ran the air at about 40psi at a constant pressure, all in all it works well and the chips go flying all over the place like anticipated.

    #41296

    Ryan
    Keymaster

    Do you have a site for your kits yet?

    #41373

    Kevin Lopez
    Participant

    You can pick up my kits at vicious2.com/shop. We’re having a sale on cracked rollers. Order now and get an air nozzle that doesn’t leak half the air before it gets to your end mill.

    New video, guess a little better quality than the old one. Cutting the 3/8″ tall part I put above. Everything came out nice except for a tiny bit of chatter at specific points in the finish. All in all a good run, I think I have it dialed in! Now I need to run it 8 hours a day.

    5mm DOC, 550mm/s @ 11% stepover for the pocket. 8% step length, 50% width, 800mm/s for trochoidal. Total part time was around 17 minutes.

    1 user thanked author for this post.
    #41375

    Ryan
    Keymaster

    Careful with those speeds, you are limited to 120mm/s XandY before steps get skipped, you can put in those numbers because the acceleration is limiting you because of the small travel. If you really want to go faster either increase the acceleration and jerk numbers in the firmware, and/or get larger pulleys.

     

    I was asking about a site because a friend of mine is asking for suggestion on electric skateboards.

    #41381

    Kevin Lopez
    Participant

    Oh sorry, thought you were just joking. Once I get a few of these cut I will list them on a forum, ebay, and maybe amazon but I don’t know for sure. I have my design all tested for the mount, just need some more 1/4″ aluminum and I am good to go for prototyping. All it will be is the mount, a 608rs idler system, and the timing belt. Want to verify it works before I buy hundreds/thousands of screws, I am sure you know the feeling.

    For a LOT of information I would lead him towards https://www.electric-skateboard.builders/. That is by far the biggest electric skateboard/longboard with a lot of beginners as well as advanced user info.

    Dang what a fluke, I mean’t to say not mm/m not mm/s. My brain is still calculating for 3d printing. Let me go change all of those, you must think I am crazy!

    #42959

    Kevin Lopez
    Participant

    Aaaanooother update. To anyone trying aluminum, seriously get a quality air blast. Without it you are at such a disadvantage, the whole process of cutting it will just not workout nearly as good, that is if you can even finish a cut without the end mill gumming up.

    Turns out the hose and nozzle I was using was garbage! The kind I used to have that was a china import http://www.ebay.com/itm/Mist-Coolant-Lubrication-Spray-System-Unit-for-CNC-Lathe-Metal-Milling-Machine-/311768128985?hash=item4896d41dd9:g:9lMAAOSwf-VWYj6x

    Not good at all. I still use the block and valve though. I recently upgraded for actual Loc-Line, made in the USA. Wow, what a difference. For $10 this thing barely leaks any air out and has a variety of nozzle choices. Highly recommended. Now my air comes out at 40psi instead of 25, and it made all the difference. The chips evacuate so good, even at 30k rpm I am getting minimal chip recutting.

    View post on imgur.com

     

    It’s just so good :O

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