Dewalt 618 plate

New Home Forum LowRider Hardware Development – LowRider Dewalt 618 plate

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  • #105151
    David Fisher
    Participant

    I’ve redesigned the gantry plate and dust hose for the Dewalt 618. No clue how it’s going to work, but it looks pretty awesome!

    2 users thanked author for this post.
    #105155
    Jeffeb3
    Participant

    That does look awesome.

    #105156
    David Fisher
    Participant

    I’ve included mounts for a second stepper. My 3D printer is apart, but as soon as I get the prints done I’ll post pics of the dual motors.

    1 user thanked author for this post.
    #105287
    Ryan
    Keymaster

    Does that fit with the rest of the parts or do you need to change the xz main and y plate?

    #105293
    David Fisher
    Participant

    Hey Ryan, it’s a direct replacement for your standard mount.

    #105370
    Colton McCormack
    Participant

    Ooh, that’s nice. I bought a 611 for my lowrider but already have a 618 and both bases. Being able to sell the 611 and let the 618 serve double duty would be sweet. Wondering about how all that extra weight will fare, though.

    #105371
    David Fisher
    Participant

    I have no clue how it’s going to handle the weight. It’s 11 pounds mounted. I’m building a full sheet table so I’ll update once I’m done. This isn’t my primary machine so it’s moving kinda slow.

    #105452
    Greg
    Participant

    I’m in the same boat as Colton.. I have a 618 I owned prior to making the low rider with multiple bases.  I notice the 611 really doesn’t like some of the sideways forces I put on it.. interested to hear how it goes !

    #105476
    Barry
    Participant

    You bog the 611 down on the lowrider???

    #105480
    David Fisher
    Participant

    I want to cut 18 gage sheet metal and the calculations say 6000 RPM for a 1/8 inch bit. 618 goes down to 8000 and raises voltage to maintain torque.

    I didn’t realize how much bigger it was.

    #105502
    Ryan
    Keymaster

    That is not enough information at all. The 660 cuts steel just fine, 611 has more than enough, more power is not a huge concern.

    #105503
    Ryan
    Keymaster

    For these machine the rigidity is always the limiting factor.

    #105508
    Greg
    Participant

    You bog the 611 down on the lowrider???

    It doesn’t bog down but If I push it hard I will start to hear some nasty screeching sounds like metal on metal?  Thought it was just more force than the little trim router likes on a long bit.

     

    #105510
    David Fisher
    Participant

    Greg… that sounds like a bad bearing.

    #105511
    Greg
    Participant

    Greg… that sounds like a bad bearing.

    Hmm… great must have come like that new 🙁

     

    #105512
    David Fisher
    Participant

    Ryan,

    I understand those parts will cut steal just fine, I’m concerned more about bit life.

    #105515
    David Fisher
    Participant

    Greg,

    I’m betting its just your material squealing as your cutting it. It can be kinda annoying. Try adjusting your feeds and speeds.

    #105520
    Greg
    Participant

    Greg,

    I’m betting its just your material squealing as your cutting it. It can be kinda annoying. Try adjusting your feeds and speeds.

    I don’t think that’s it but if I am the only one seeing this maybe I will just stop babying it and collect on the warranty if it blows up.

     

    #105521
    Ryan
    Keymaster

    Ryan, I understand those parts will cut steal just fine, I’m concerned more about bit life.

    What info did you plug in to get those numbers, and in what calc? Unless you specify they tend to not be anywhere close to the settings we need for these machines, as rigidity is a factor here, unlike $$$,$$$ machines those calcs are usually designed for. If you look at the calc on the basics page and watch the resulting load keeping it under 1.9kg-ish, you will get a good number. Or just watch a few of the steel videos to get a sense of the speeds we use. It is not like wood where the numbers are all over the place, if you numbers are not perfect you break a bit. You will see all of us have very very similar numbers in steel in similar machines.

    #105522
    David Fisher
    Participant

    Ryan,

     

    I created an excel spreadsheet using these website as resources to calculate the best RPM for my tool.

    From the Math it should only take .12 horses (87 watts) to cut the metal.

    About 30 percent of that is needed to move to tool around. (I’m not sure if my math is correct here, but I got 5 ounce inches if you throw friction out the window and only look at the forces on the head)

    6112 RPM is the target for traditional milling and longest bit life.

    Or maybe it was 3056… I’ve played a lot with the numbers to see what effects what.

    I’m just doing this for fun, and to learn. If it works it works, if it doesn’t it doesn’t.

    I’ll get it going sooner or later.

     

    #105548
    Ryan
    Keymaster

    I would compare to the Calc I keep referring too, that is by far the easiest for me to get real, good numbers and your sheet is missing many factors, Yours looks like just ideal chipload, there should be a very large range that is ideal for any endmill.

    We have extremely high RPM spindles, you are trying to use a 4 flute end mill at 6k, a single will do the same at 24k and have better chip evacuations and a better torque output from our routers.

    #105967
    David Fisher
    Participant

    I’m getting really excited about this. The router doesn’t seem to stress the tubes at all. I only get to work on it on Fridays and hope to have it up running soon. The center of the table is supported by a 4×4.

    #106565
    David Fisher
    Participant

    I got the second stepped installed on the 618 gantry today and as you can imagine it’s an absolute unit. I’m measuring about .5mm of sag center if the beams.

    Ryan is absolutely right. This is complete over kill, but this was my first design project and it’s been a lot of fun.

    #106567
    David Fisher
    Participant

    Without the cutter

    #106874
    David Fisher
    Participant

    Well guys, I’m almost cutting circles in 2.5mm carbon steel on a single pass with no oil. I’m really happy with the results so far. For what I’m using it for the holes will never be seen. I’m going to try doing some lead ins next time. Lets see if that helps even out the flat spot.

    Also need to increase the travel height.

    1 user thanked author for this post.
    #107738
    David Fisher
    Participant

    Had some more time to play with it today. I’m really happy with the results. I’m using this bit and it’s holding up really well.

    https://www.amazon.com/gp/product/B00KW05IFK/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

    Real world speed ended up being 14k.

    This is all done single pass using Trochoidal Milling. 7.5mm/s 5% step 25% width with NO OIL.

    Thanks again Ryan!

    • This reply was modified 3 months, 3 weeks ago by David Fisher.
    1 user thanked author for this post.
    #115053
    Jason P
    Participant

    David, would you mind sharing the CAD file for your plate?  I’m considering using the Hitachi M12VC which is similarly large, and could use your plate as a starting point.

    Have you had an issues over the past few months re: weight or anything else?

    Thanks, any hints are appreciated.

    #115054
    David Fisher
    Participant

    I haven’t had any problems with it, but I don’t keep the router stored in the gantry. What’s your email address and I’ll email them to you.

    1 user thanked author for this post.
    #115058
    Jason P
    Participant

    Thanks, it’s jasonparekh at gmail.

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