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Post by ricphoto on Mar 7, 2018 18:13:14 GMT -5
Wanted to make something for my wife for being so understanding about the new CNC so I decided a wall mount jewelry cabinet with a carved door insert would be nice... Found a nice 3D model on the net and proceeded to prove to myself how little I actually knew after 2 weeks with the CNC ;-) No matter how I tweaked and fussed around with it I came out with 3 passes totaling 44+ hours...This actually started to seem ok as the 1st few versions were coming in at 77+ hours. In the middle of cutting it now so I had some time to post this, eat lunch and walk the dog... 9"x15" model on 4/4 (full 1") Curley Cherry...1/2" border on edges for insert into door frame slot... 1st pass: 1/4" end mill ran 40 mins 2 pass: 1/8" ball nose at 10% step over projected at 4+ hours (about 30% done in pics below) 3rd pass: 1/16" ball nose at 8% step over projected at 42 hours !!! Kept playing with the settings and offsets till I got what looked like clean, sharp model edges in the preview...was seeing "scallops" for the 1st few versions till I discovered the "offsets" and a second finishing pass... Looking pretty good so far...almost 2 hours into the 1st finishing pass...hopefully the 2nd finishing pass will get rid of the fuzzies   |
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Post by ricphoto on Mar 7, 2018 18:17:03 GMT -5
and another few shots:   |
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Post by cletus on Mar 7, 2018 19:26:34 GMT -5
Hey Ric, Looks really nice. Your wife will love it. Love to see it when it is finished.
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Post by ricphoto on Mar 7, 2018 19:27:31 GMT -5
OK...that wasn't too bad...just over 3 hours for the 2nd pass / 1st finishing pass with the 1/8" ball nose at 10%... not the 4+ hours the guesstimator in VCarve predicted...a little rougher than I expected from the previews but nothing too bad so far...something funky happening with her fingertips so I'll have to keep an eye on that... 3rd pass / 2nd finishing pass with the 1/16" tapered ball nose just started...at 8% stepover it's at least going to go over night...hopefully not the 44 hrs projected but we'll see ;-p    |
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Post by arsystems on Mar 7, 2018 20:36:32 GMT -5
wow very cool.. even if you have to do a little light sanding/cleanup it will be worth it that's a nice looking piece!
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Post by ricphoto on Mar 7, 2018 21:02:37 GMT -5
wow very cool.. even if you have to do a little light sanding/cleanup it will be worth it that's a nice looking piece! Thanks...I thought it looked a little nicer / different than the usual clipart pieces you see out there... Just went out and peeked and the 2nd finishing pass looks great ... all the furring is gone in the 1 1/2 inches that it's done in the last 2 hrs...silky smooth finish ;-) looks like it'll be closer to 18-20 hrs instead of the projected 44 if it keeps going at that rate...I'll peek a few more times tonight but feeling relaxed and ok with letting it run overnight... I be happy ;-) |
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Post by ricphoto on Mar 7, 2018 21:04:55 GMT -5
Hey Ric, Looks really nice. Your wife will love it. Love to see it when it is finished. Thanks Cletus...it should be encouraging to you to...remember I've only been at this for a little over 2 weeks...never touched a CNC before that... There's hope for us newbies ;-) |
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Post by traindriver on Mar 7, 2018 22:06:55 GMT -5
What is your feed rate from your tool database? You might be able to speed up your feed and speed to reduce time for the next one. I've had mine for over a couple of years now, and I'm still cautiously moving up my feed rate from the default value every time I do carving. I'm at 100 ipm using my 1/16th ballnose, but I'm sure I could go faster.
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Post by ricphoto on Mar 7, 2018 23:02:43 GMT -5
What is your feed rate from your tool database? You might be able to speed up your feed and speed to reduce time for the next one. I've had mine for over a couple of years now, and I'm still cautiously moving up my feed rate from the default value every time I do carving. I'm at 100 ipm using my 1/16th ballnose, but I'm sure I could go faster. Ouch...Thanks for the tip (I think ;-)...just checked mine and it's at the default 25 ipm...guess I could have saved a bunch of time...guess this is how we learn That being said I'm pretty happy with how it's going so far...looks like there will be little sanding in some areas and the electric toothbrush trick might take care of most of those...larger flat areas are just that...silky smooth and flat... Here's where it's at after 4 hrs:   |
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Post by cletus on Mar 7, 2018 23:27:47 GMT -5
Ric, thanks for the encouragement. I'm an old dog may not get the new tricks down as fast as you young whippersnappers.
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Post by ricphoto on Mar 7, 2018 23:42:41 GMT -5
Ric, thanks for the encouragement. I'm an old dog may not get the new tricks down as fast as you young whippersnappers. High School class of 1969 here son ;-) |
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Post by stevem on Mar 8, 2018 0:07:07 GMT -5
To clean out the fuzzies, I use a Dremel with the 3M bristle brushes. They really work great. I use the yellow ones that are 80 grit 1" diameter.
You can get them on Ebay. The other thing I tried was a small brass brush from Harbor Freight. Just a bit stiffer than a tooth brush.
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Post by cletus on Mar 8, 2018 9:14:37 GMT -5
ric....hows the carving going? By the way high school Class of 1972.....gramps.
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Post by arsystems on Mar 8, 2018 9:27:52 GMT -5
ric, I am going to post a thread at some point discussing what I cut and how fast, but just for reference for you here...
I cut HDPE plastic at 165ipm, .25" depth of cut, 40% optimal load (tool engagement). Some on here seem to think that is aggressive, although I use the machine at this speed and sometimes faster on a daily basis. It is more than capable.
You may want to spend some time learning how to increase the speeds and also enable the program to control the speeds and not the controller. There is a setting on the controller that ignores programmed speeds, you can disable it and set them in your Gcode.
25ipm is no where near the capability of these machines. Especially on a finish pass with a small ball nose. I'd go up to at least 100, if not 125-150. Good luck man!
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Post by ricphoto on Mar 8, 2018 10:04:50 GMT -5
Woke up to a beautiful sight this morning...all the way up and over her arm and starting into the heavily detailed parts of her face, hair etc... Only got up 2x during the night to check on things ;-) During one of those wake-ups I ordered a variety of finishing tools...Thanks for the tip Steve...Though as you can see there's going to be very little sanding needed (so far) ARS...I'd love to read that...this little exercise brought home the need to better understand feeds, speeds and the related in a big way...Doing a simulation with Traindrivers recommended settings I saw the projected time drop 75%... Here's a few shots from about 630am...meant to get up earlier but these "old bones" sure like the heating blanket on these cold mornings...    |
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Post by Deleted on Mar 8, 2018 10:09:51 GMT -5
G-Wizard is on sale at 15% off until this Friday, this happens multiple times per year, you might consider getting at least the 30-day trial to optimize your cuts. You can eliminate your rough pass 2 and go from the 1/4" to the tapered ball finish pass. The purpose of the first rough pass is to get the remaining stock thickness to where the finish pass can remove the remaining stock in one pass. Babying your cuts will actually cause problems like burned wood and bits that wear out faster or break beside the obvious taking longer to machine your project. www.cnccookbook.com/cnc-router-feeds-speeds-calculator/ |
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Post by Deleted on Mar 8, 2018 10:13:08 GMT -5
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Post by arsystems on Mar 8, 2018 10:20:27 GMT -5
that is going to be a nice gift... hopefully it scores you some brownie points with the mrs.
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Post by ricphoto on Mar 8, 2018 10:35:17 GMT -5
One thing I do for 3D details is put a clear finish like thinned poly or shellac on the wood to make the fuzzies rigid, then I use an electric toothbrush to get into the nooks and crannies and breaks them all off: smile.amazon.com/Oral-B-Rechargeable-Electric-Toothbrush-Powered/dp/B01B4I0Y8E/ref=sr_1_5_a_it?ie=UTF8&qid=1520317193&sr=8-5&keywords=braun+3d&dpID=31fPO6m85SL&preST=_SY300_QL70_&dpSrc=srch Someday I'm going to convert it from battery power to a standard wall wart power supply. Thanks Fein...I saw the toothbrush idea in one of your earlier posts and ordered it...Thought that and a little pumice might be a good polishing system...I'll check out the CNC cookbook again as last time I looked it seemed pretty expensive but I really didn't appreciate what I was looking at and how much time/$$$ it could potentially save... |
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Post by ricphoto on Mar 8, 2018 10:38:15 GMT -5
that is going to be a nice gift... hopefully it scores you some brownie points with the mrs. Yup...she saw it before going to bed last night and finally started to get more of what this whole thing was about...she wasn't too excited about the 1st signs/carvings and toolbox inlays but when shown how I could make gifts for her it all started to make sense ;-P |
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Post by arsystems on Mar 8, 2018 13:25:16 GMT -5
haha of course!
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Post by dickdelmi on Mar 8, 2018 13:37:50 GMT -5
Nice job Ric. Great model and beautiful piece of wood. Where did you get the model? Much better than what I see on Vectric's Design & Make.
For your info I ran the last pass on my Eagle job with a 1/16" ball nose at 18k and 9% stepover and 0.05 cutting depth. Produced nice curl chips on the cut and very few fuzzies which were removed with a brisk rubbing with an old piece of turkish towel.
High School class of 49, UW class of 53, USA 53 thru 55.
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Post by ricphoto on Mar 8, 2018 14:02:03 GMT -5
Thanks Dick...The wood is from a stash I've had for years...Built a place on 5 acres down by Elbe/Mt Rainier and met a cool logger who helped me turn the Cherry and Maple trees we had to remove into some really nice furniture quality sticks...ended up with about 1,000BFT of each...most was/is REALLY figured...still have a bit left...going to tap into a full 2"x10"x9' board for the next version of that in a "shadow box"...
Model is from Etsy...(some interesting and reasonably priced offerings up there...) it reminded me of my wife (she's Hawaiian) and the 1st time she introduced me to the back country of the Big Island 36 years ago...fun trip...we've been married ever since ;-)
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Post by cletus on Mar 8, 2018 17:26:46 GMT -5
Beautiful!!!!! Cool story too.
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Post by ricphoto on Mar 8, 2018 18:41:45 GMT -5
OK...23.5 hours in and we're getting close...about 1" left to go so maybe an hour or so...love the way it's looking...so smooth in spots it looks like it's already polished...I be happy Have the next 2 slabs of Cherry almost ready to go...10"x19"x2"...a quick surfacing pass through the planer when V1 is done and I'll set-up V2...Thanks to the tips from TrainDriver, Fein and Arsystems this one should only take about 30% of the time even though it'll be about 15% larger without the cropping I had to do to V1 (top and bottom to fit the cabinet door)...She'll have both hands and all of her butt in this one ;-)   |
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Post by ricphoto on Mar 8, 2018 21:20:01 GMT -5
ok...right at 24 hrs total and she's done...small amount of clean-up but overall pretty happy...can't wait to see her with an oil finish and buffed out... Got right into V2 on the big slab with the setting changes I got here...rough pass went from 45 mins to right at 20 mins...looks (and smells ;-) like 100 rpm is a little fast for the .25 EM...just a touch of burning. Have the 1/8th and 1/16th BM's set at 75 rpm so we'll see what happens with them... been a great learning experience so far...even found out the controller will let you restart in the last position after a power outage...was at the last 1/2" of run when that happened...big relief...    |
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Post by cletus on Mar 8, 2018 21:51:54 GMT -5
Ric, that is absolutely amazing! Is this going to be a carving or incorporated into a piece of furniture?
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Post by ricphoto on Mar 8, 2018 22:04:42 GMT -5
Ric, that is absolutely amazing! Is this going to be a carving or incorporated into a piece of furniture? Thanks Cletus...It's going to be an insert panel for a door on a cabinet I'm building for my wife...2nd one will be a wall hanging |
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Post by traindriver on Mar 8, 2018 22:07:03 GMT -5
100 ipm isn't too fast. If you're burning the wood, you need to slow down your spindle speed. When I started, I was in the 18 - 21k range and burned a lot of bits, thinking I was feeding too fast, when actually it was the opposite. I would suggest somewhere around 12 - 15k, although Fean would be a much better resource for a good spindle speed. Looks awesome, by the way!
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Post by ricphoto on Mar 8, 2018 22:30:55 GMT -5
100 ipm isn't too fast. If you're burning the wood, you need to slow down your spindle speed. When I started, I was in the 18 - 21k range and burned a lot of bits, thinking I was feeding too fast, when actually it was the opposite. I would suggest somewhere around 12 - 15k, although Fean would be a much better resource for a good spindle speed. Looks awesome, by the way! Well it looks like you were spot on with the 100 rpm for the .125 BN...just at an hour on this pass and it's over 60% done vs 4+ hours the last time...and the chips look much better...Thank you (edit: Opps... I forgot I set it at 75 rpm for the final pass (1/16th BN) this time around...wanted to creep up on it with the smaller bits...only 100 rpm for the .25 EM roughing and 1st 1/8th" finishing pass) I'll have to find my copy of the "manual" to decipher the speed readout to see what it corresponds to in RPM...know there's a chart somewhere...    |
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