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Trevorh08/07/2019 14:23:04
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268 forum posts
53 photos

Hi All

looking for comments on the following equipment

collections/cnc/products/sainsmart-genmitsu-cnc-router-3018-mx3 >**LINK**

My son is looking to get into CNC for his model making

comments please

regards Trevor

Trevorh08/07/2019 14:38:11
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268 forum posts
53 photos

Is this any good for machining acrylics and poss Aluminium or soft metals?

thanks

Ian Parkin08/07/2019 15:14:04
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644 forum posts
174 photos

I would say not

its as cheap as a cnc can get and still work

theres no software with it...mach 3 is £120 ish or the free mentioned

the motor will drive you mad with the lack of power and noise

soft wood ,foam but no metals at all not too sure about acyrilics

and it has a very small work envelope

Trevorh08/07/2019 15:28:44
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268 forum posts
53 photos

Thanks Ian, Glad we checked before he spent his money,

Thank you for the comment

Pleased I asked the question

regards

trevor

fizzy08/07/2019 15:47:13
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1602 forum posts
106 photos

This is a link to the air cooled low end version of what I have - **LINK**

they are very well made from 10mm ali plate for the uprights.

Trevorh08/07/2019 15:48:27
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268 forum posts
53 photos

Ok So I have spoken to my son and the "working Envelope" isn't an issue

based on the above what would be a reasonable entry level type of machine to go for?

The programming side of things isn't an issue as he is a professional Computer programmer by trade

Thanks

Trevor

Trevorh08/07/2019 15:50:18
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268 forum posts
53 photos

Thanks Fizzy

you obviously type faster than me...

cheers for the link

fizzy08/07/2019 15:51:34
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1602 forum posts
106 photos

this is the one I have - cant see how they do it for the money, very impressed with it and i use it solely for brass **LINK**

fizzy08/07/2019 15:55:08
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1602 forum posts
106 photos

and here is a video of me using it to drill holes in one of my burners - I had 100 to make so needed a hands off solution. Only snapped 2 drills so far and that was through sheer stupidity - not short of that! Pendle Steam Boilers CNC drilling

Jeff Dayman08/07/2019 15:55:19
1599 forum posts
39 photos

Hi Trevor, Often with machines of this type, and 3D printers, there is a large Youtube community posting about the specific machines. If you search on youtube with the make and model you will likely find LOTS of good info about capabilities / good points / bad points before you buy.

One thing I have noticed about cnc routers at the low end of the cost scale is that the motors look like ordinary Johnson-style DC plain bearing units with an adapter collet chuck tacked on. The bearings in ordinary DC motors (intended for fans or small appliances) are not designed to take heavy side or end loads as they would see in cnc router cutting or milling. I don't think the bearings in these motors would last long, especially with plunge cuts / end loads since the thrust brgs are minimal if present at all in a lot of common DC motors.

If you can find a router with a belt drive to a separate spindle (preferably ball or roller bearing) then the motor will likely last far longer and the cuts will be cleaner too. With a separate spindle you might be able to rebuild / tune / improve it or get an upgraded one if problems occur and the youtube community responds. For 3D printers for example, there are many "hot rodding" performance improvement kits for various modules of the machines, shown and reviewed on youtube.

Trevorh08/07/2019 15:59:30
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268 forum posts
53 photos

perfect

this is exactly what I needed - I will pass the above onto my son for further investigation

cheers

Barrie Lever08/07/2019 16:48:25
323 forum posts
1 photos
Posted by Trevorh on 08/07/2019 14:23:04:

Hi All

looking for comments on the following equipment

collections/cnc/products/sainsmart-genmitsu-cnc-router-3018-mx3 >**LINK**

My son is looking to get into CNC for his model making

comments please

regards Trevor

Trevor

I always worry about machines like this, in that do they do what the aspiring owner really wants?

I think a lot of them kind of get used a few times and then pushed in the corner through disappointment.

I took a look on Youtube for this router and sure enough there are plenty of video's, although as is the case with most of these reviews they are very focused upon unpacking and assembly.

I did watch a video where the chap machined both acrylic sheet and aluminium, the parts were cut and released from the sheet, the results were OK and for the price there is not much else that will CNC cut even thin aluminium.

As others have mentioned the absolute achilleas heal of this machine is going to be the spindle, the side loads that get imposed on the spindle are higher than a lot of people give credit for, in my experience an entry level spindle is the Proxxon type, they have a good aluminium nose casting and could be made to fit a machine such as the 3018.

You don't see many routers where the table moves in one axis, on the 3018 I think that the table is quite light and will resonant when the going gets even moderately tough, almost by definition there will not be much mass in that moving table being as it is made from some aluminium extrusions.

The best way to cut acrylic at a hobby level is with a cheap laser cutter, the cut finish is superb on just about any Co2 laser (they are the cheap type) and the engraving onto the acrylic is very pleasing to the eye, the cheap K40 lasers will also cut wood, mdf, cardboard but not metal.

Laser cutting and 3D printing do not expose the limitations of a lightweight X,Y,Z mechanism as there is either none or very low loads on the mechanism, routing cruelly exposes a setup that is lacking in rigidity.

Try and stretch the budget a bit then choices open up into very useful machines.

Look at the following

  • Stepcraft
  • Sorotec
  • BZT
  • CNC Step

The last two machines are highly capable and can earn you money if required.

Good luck.

Barrie

Trevorh09/07/2019 14:28:09
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268 forum posts
53 photos

Barrie

thank you, my son is now reviewing the alternative machines but has stated he is tending towards having a go at constructing his own.....

Could/should be interesting

thank you to all that have commented

regards

Trevor

Baz09/07/2019 15:03:11
245 forum posts

Fizzy what size holes are you drilling?

Trevorh09/07/2019 15:22:36
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268 forum posts
53 photos

I think he is wanting to engrave and work with acrylics but not sure

He lives over on the IOW so I dont get to see him often

hence not sure what he is trying to achieve

Thanks

fizzy09/07/2019 20:43:59
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1602 forum posts
106 photos

Hi Baz - they are 1.5mm with a bit too fast feed rate. Slow the feed right down and 6mm is good.

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