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You Know You Want a Revolution
#1
Got a BobsCNC Revolution 4th axis router, with a Makita trim router spindle.   Great fun!

Picked the package deal with Vectric VCarve Desktop, as recommended by Bob, for it's rotary axis wrapping capability.  This machine has X, Z, and A axes, no Y.  Kinda sorta somewhat like a lathe with a router instead of turning tools, although this lathe will turn a square.  Still learning how to use it, in conjunction with turning one end of a 24x48' barn into a woodshop.  As usual, despite now being completely retired, there's never enough time for everything.  Also got a Sainsmart LE5040 and rotary axis this summer, plus Lightburn, same time issue.  Spending more time working on the shop than in the shop, still, this has been a slow 5 year project that started with building a wall followed by breaking up the old concrete floor (500 drywall buckets of rocks and busted up concrete) only to find another floor a foot deeper.  None of the surviving previous owners (120 year old farm) knew it was there or why the floor had been raised.  Good enough to build an insulated treated wood floor over it, and got enough height for a 2hp cyclone dust collector which still lacks ductwork.  As I said, never ending...

Kirk
------
KS Printrbot Plus, modified
Thingybot Delta
QU-BD One Up (parts, received with bad motor)
QU-BD RPM (incomplete box-o-parts, milling package never received)
Maslow CNC (4'x8' chain drive)
Zenbot Mini (6"x8" router, grbl_ESP32)
SainSmart Genmitsu 3018Pro
Ender 3 Pro
BobsCNC Revolution
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#2
Hi Kirk,

That's an interesting thing - would you call it a louter or a rathe? Smile. Router, lathe, what's the difference?

I was surprised when I first saw the machine, because it simply didn't match my expectations - I thought it would be a normal router. But it's not quite Smile. It seems like it will be great for a very useful class of things. Do you have a specific project in mind for it?

I haven't been making much of anything - had to rustle up a new job, so spending got put on hold for a bit. If I were going to buy a normal router, right now this one is at the top of my list:

https://sienci.com/product/longmill/

Once I get settled in to the new gig, I might pull the trigger on that.... or, I also got a great deal on some second-hand extruded aluminum pieces, so I could try to throw together my own frame and see what happens. Building a good CNC would be a challenge... maybe I could just do a laser cutter/engraver instead.

I also have a house to remodel... as you said, it never ends, apparently.

Enjoy your new toy - and of course, post any results in the Community Project Showcase section Smile.

Stan
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#3
It never ends, I've been here for 43 years and found that if you think you're done you've missed that you need to start over again.

I'm not sure what to call it other than 4th axis CNC.    Lathe doesn't really fit (I have too many, both wood and metal, lathes), while a lathe can't turn a square (you can come somewhat close with eccentric chucks or creative mounting) this can't hollow out a bowl.  I think of it as more complementary.  I work mostly with home-harvested wood (have around 70A of woods) that only looks round, so I've been using a wood lathe to prepare stock for the Revo, way faster than 3mm deep cuts with a 1/4" bit even at 100ipm.  Making it straight afterwards is pretty easy, I've been hand typing gcode, but I'm the kind of guy that thinks typing G1 X300 A40000 F2000 is pretty cool (or distance/stepover times 360).  The A axis is effectively infinite, although that can bite you when you do a G1 A0 instead of resetting zero. 

My original motivation for the Revo, and for woodturning, was ornamental turning and rose engines.  Regrettably I still haven't gotten there, but I'm closer.  I found rose engine simulation software on github, it was written for a homebuilt lathe/cnc lashup and will need modification but it's a good starting point.  The biggest problem I see is that even CNC ornamental turners use a thing called a cutting frame instead of a spindle.  It's a belt driven disk with cutting tools stuck in the sides so instead of a single point spindle it cuts a disk shaped path.  Definitely possible to simulate, but are my memories of engineering math classes a long time ago (I went to engineering school with a slide rule) good enough to figure it out?  Until then I've been dinking around on walking sticks (bad knee...) and for grins made a wooden spoon.  Not particularly efficient to start with 3" round stock and turning almost all of it to chips (vectric seems to only be able to start with round stock on a 4th axis) but it was an interesting project.

The Revo is too big to take on our winter journey south so I'm thinking of building one of these while we're down there.   Long enough to do a walking stick without flipping it end for end.  I already have most of the parts so maybe it'll actually get done.  This site has a lot of information on making them.  Turns out that 2" diameter maple, removed a lot of brush this summer and stacked it to dry, isn't particularly straight or round, so I may need to rethink my planned source of material and have a maple tree or two turned into 2x2s

Kirk
------
KS Printrbot Plus, modified
Thingybot Delta
QU-BD One Up (parts, received with bad motor)
QU-BD RPM (incomplete box-o-parts, milling package never received)
Maslow CNC (4'x8' chain drive)
Zenbot Mini (6"x8" router, grbl_ESP32)
SainSmart Genmitsu 3018Pro
Ender 3 Pro
BobsCNC Revolution
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#4
I know (in the forum membership sense) a couple people with Longmills, they seem to be happy with them. I'm not impressed with the machine design, with that hardware store aluminum angle. If I had the space I'd get a ShapeOKO 4, or build an MPCNC.
------
KS Printrbot Plus, modified
Thingybot Delta
QU-BD One Up (parts, received with bad motor)
QU-BD RPM (incomplete box-o-parts, milling package never received)
Maslow CNC (4'x8' chain drive)
Zenbot Mini (6"x8" router, grbl_ESP32)
SainSmart Genmitsu 3018Pro
Ender 3 Pro
BobsCNC Revolution
Reply
#5
I was pretty sure it wasn't any kind of lathe - I presume that the rotary axis doesn't spin either fast or freely. I just wanted to get the lame word play out of my system Smile.

The target of your link in the phrase "building one of these while we're down there" appears to be messed up. The target appears to contain some of the text of your post - possibly a failed paste? Nevertheless, from the other link, I think you are talking about a 'CNC Rotary', or something to that effect.

Regarding the longmill, there's a fellow on youtube who seems knowledgeable to me (since I barely know anything about CNC machines), and he posted a video of himself climbing up on to the gantry of the longmill, and riding it for a little while. Of course, there was no measurement of any flex, but it didn't obviously flex either, so it was a pretty good advertisement for the device Smile. It doesn't hurt that the size and the price are right for my situation. I've seen the Shapeoko - if I recall it was higher in price... I periodically check in on X-Carve too, but they are more expensive now too. I'll check out the other one as well. Oh wait, I already have.

I saw an MPCNC someone built at a maker faire. It certainly seems like a viable option, in spite of the fact that my filament printer is trapped behind an exercise machine, and I haven't used it for a while Smile. I actually have a bunch of parts myself... I just need to schedule some time to do things.

I need fewer hobbies... Smile.

Stan

Oops, posted as Administrator - was looking into the email thing. Oh well Smile
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