My new acquisition.  

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triform
(@triform)
Estimable Member
Joined: 9 months ago
Posts: 215
2019-12-28 10:22 pm  

I decided to get one of the cheap Chinese small CNC machines. $168 shipped.

IMG 20191228 170047
IMG 20191228 170104

It was well packaged and had all the parts and none were broken!  It took about an hour to assemble and came together with no issues or user errors 🙂  Almost a "Bob's your uncle" job.

I did change out the Y-axis stepper motor for a bigger torque one I had on hand, as the included one was a bit sluggish at the end of the full travel.  Will be adding end-stops for all axis tomorrow.  I also have a pendent and more cutting bits on order.

I'm hoping 8+ years of 3d printing experience will help me to use it.

Scott


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Robo Pi
(@robo-pi)
Robotics Engineer Moderator
Joined: 10 months ago
Posts: 1603
2019-12-28 11:30 pm  

Nice.  Looking forward to see what you make with it.

DroneBot Workshop Robotics Engineer
James


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hstaam
(@hstaam)
Eminent Member
Joined: 10 months ago
Posts: 48
2019-12-29 4:11 pm  

 

Enjoy!

hj

hj


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triform
(@triform)
Estimable Member
Joined: 9 months ago
Posts: 215
2020-01-06 1:14 am  

Well, I have been familiarizing myself with the CNC machine some this week and got brave enough to do the first cut.

 

IMG 20200105 195618

 

Not bad for cheap plywood and the bit's they sent with the machine, needs some sanding though.  It seems to work fine in my dry tests. 

 

I have added a few knobs for the X and Y to allow easy movement by hand. I've also end stop switches to the X and Z axis and will add the Y stops next week.  I am planning on making a couple of "No Soliciting" signs and some NEMA 17 motor mounts.

 

It will be mounting the machine down with brackets I made in Tinkercad and 3d printed. It gets pretty jittery as it cuts. I think a rubber pad would also be useful. 

 

Scott

 


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triform
(@triform)
Estimable Member
Joined: 9 months ago
Posts: 215
2020-01-17 4:28 pm  

I have the CNC in its place now and am starting to try so real stuff.  First a sign!

IMG 20200117 105346

 

I have added cork to the "feet" on the machine to try and keep vibration down as cutting will make a good bit of noise! I've also made some non-metal hold-downs. 

I need to find some good design apps that I like and that will gen gcode.  Looking into Inkscape for flat types and fusion 360 for 3d.

Scott


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triform
(@triform)
Estimable Member
Joined: 9 months ago
Posts: 215
2020-01-19 5:01 pm  

Here is my first attempt at cutting acrylic.

IMG 20200119 114301
IMG 20200119 114319

 

This is from a 200mm X 250mm X 3mm sheet. 

I'm not sure if I had the correct end mill for the job, but it worked. It too @ 5 mins to cut and drill it all out.   I do need to figure out better ways to hold big sheets like this down evenly. 

I am still learning CNC and have a long way to go.

Scott


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Pugwash
(@pugwash)
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Joined: 10 months ago
Posts: 970
2020-01-19 5:58 pm  

@triform

Cool!

You will probably always have to finish off the edges manually. The acrylic sheets that I buy locally, I believe is laser cut.

SteveC - Topple Rudd Poltman


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triform
(@triform)
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Joined: 9 months ago
Posts: 215
2020-01-19 6:48 pm  

@pugwash

Thanks, Steve.

I made some changes to the design and ran it again, adding a bit to the cut depth. I increased the spindle speed and lowered the feed rate a little a well adding more double-sided tape pads.  It cut a good bit better this time on the edges.

image

I think it's good enough for a sub $200 CNC, but it's what you would expect for this class of machine.  I may get a 8-15w diode laser for it, but I am not in a rush.  These will not cut clear acrylic but will wood and dark acrylic.  Before I add a laser, I would want to optically enclose it so going in and out of the garage will not be an issue for living beings 🙂 

Scott   


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Pugwash
(@pugwash)
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2020-01-19 8:15 pm  

@triform

Are you prepared to reveal where you sourced this CNC machine, I may be up for one too.

And what size bits does it take? Can I use my existing Dremel bits?

SteveC - Topple Rudd Poltman


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triform
(@triform)
Estimable Member
Joined: 9 months ago
Posts: 215
2020-01-19 9:29 pm  

@pugwash

Sure!

I got it from this eBay listing.

The seller is "acwholesaler".  I liked the price and feedback.   I paid 165$USD shipped.  It's the pro 3018, and I debated on the non-pro vs the pro, but I am glad I spent the extra on it.  The pro is easier to assemble I think and is more rigid and has a real collet.

With the collet I have, it takes 3.175mm bits and end mills.  I think a drimmel is that size.  I'm going to order a set of collets to allow for up to 7mm shank bits. They also make smaller collet inserts.

I have gotten a few bit/end mill sets off eBay and Amazon. Straitcuts, ball-ends, down-cuts, up-cuts and a few others.  I'm still learning about bit/end mills, as they are very new to me.

I have a hand controller coming for it, so I can just put my files on an SD card and not have a computer nearby getting dusty.  There are advantages to having the computer though I guess. 

 

This post was modified 3 months ago by triform

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Pugwash
(@pugwash)
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2020-01-19 9:47 pm  

@triform

Checked the link you gave and it said "Does not ship to Germany" ? 

Then I tried AliExpress, and I don't want to make you sick but I found the same basic model (without laser) for $127.39 and 7 days free delivery from Spain.

SteveC - Topple Rudd Poltman


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triform
(@triform)
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Joined: 9 months ago
Posts: 215
2020-01-19 9:53 pm  

@pugwash

I found a seller in the States that had them for 125$ shipped, but I would have replaced the coupler it used for a real collet and that added @ 10-15$.  I also like better support on the pro, so I'm happy with the extra $.  Many like and use the standard though! Minh here does amazing stuff on one! 


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Pugwash
(@pugwash)
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Posts: 970
2020-01-19 10:00 pm  

@triform

I meant the Pro basic model!

https://www.aliexpress.com/item/32984639838.html?spm=a2g0o.productlist.0.0.391574f3jjJLoo&algo_pvid=19a669a3-c238-4b04-b359-e10317f8dffc&algo_expid=19a669a3-c238-4b04-b359-e10317f8dffc-0&btsid=c1580944-b7a0-4260-9a20-11d03f12b6b8&ws_ab_test=searchweb0_0,searchweb201602_7,searchweb201603_53

And as I am still self-employed I still have a VAT registration number and I might be able to screw them for another 19% or whatever the VAT in Spain is ? ? ? ? 

SteveC - Topple Rudd Poltman


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triform
(@triform)
Estimable Member
Joined: 9 months ago
Posts: 215
2020-01-19 10:02 pm  

@pugwash

Yeah, 152$ is a good deal.  🙂


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Spyder
(@spyder)
Honorable Member
Joined: 10 months ago
Posts: 668
2020-01-23 10:16 pm  

That's really nice !

The specs on that thing say that it's 300 X 180, so how did you get a 200 x 250 into it ?

This post was modified 3 months ago by Spyder

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