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  #1  
Old Tue 21 August 2012, 07:25
paulus
Just call me: paul
 
jhb
South Africa
Thumbs up new guy

Hi all.
I am paul from sunny south africa this will be my first build on this type of make, i have tryde to build a cnc router before but not so good so i am giving it a second try. lets see how this is going to pan out.
i see there is a couple of guys from south africa on the forum i would like to know where you are from if you dont mind.

thanks.
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  #2  
Old Tue 21 August 2012, 07:40
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Welcome Paul!
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  #3  
Old Tue 21 August 2012, 16:51
JamesJ
Just call me: Jim #104 (retired)
 
Kansas
United States of America
Welcome to the group!
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  #4  
Old Wed 22 August 2012, 09:08
MetalHead
Just call me: Mike
 
Columbiana AL
United States of America
Welcome aboard. Stick to the plans and you will have a great CNC machine when you finish.
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  #5  
Old Wed 22 August 2012, 10:52
hennie
Just call me: Hennie #23
 
Roodepoort JHB
South Africa
Welkom, PM my dan gee ek jou my details ek is in JHB en so ook `n hele paar ander manne.
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  #6  
Old Wed 22 August 2012, 23:41
paulus
Just call me: paul
 
jhb
South Africa
thank you all for welcoming me i truely hope that this one will be 100% when it is done
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  #7  
Old Tue 16 July 2013, 15:27
paulus
Just call me: paul
 
jhb
South Africa
Miniature MechMate suddenly cutting - Johannesburg, S.Africa

Hi all
Ok this has taken me longer that I wanted but it is done. Now I am cutting,as you can see this is not a full size machine the cutting area is 600 x 1000.
So far I am happy with what I have done. And I think it looks good.
I just need to put the name on.
O before I forget where do I get a number.
Alberton-20130630-00933_1.jpg

Alberton-20130714-00943_1.jpg

Alberton-20130714-00945_1.jpg.

And here is the big one in the making.


Alberton-20120924-00590.jpg
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  #8  
Old Wed 17 July 2013, 00:58
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
Send a message via Skype™ to Alan_c
Why are your main beams upside down? (and your table supports come to mention it)
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  #9  
Old Wed 17 July 2013, 04:58
paulus
Just call me: paul
 
jhb
South Africa
Not sure what you mean. I have moved the table suport down so that I don't add weight to the side beams and preventing it from bowing the table. Or am I not thinking right.
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  #10  
Old Wed 17 July 2013, 05:40
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The table supports must be connected to the side beams, or else you will get a lot of vibration in those beams.
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  #11  
Old Wed 17 July 2013, 09:48
KenC
Just call me: Ken
 
Klang
Malaysia
You are thinking right, just paranoid.
Don't worry about the side beams bow... you can put a few tons on it & its won't budge...
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  #12  
Old Wed 17 July 2013, 11:19
paulus
Just call me: paul
 
jhb
South Africa
Ok I hear what you are saying gerald. The other reson why I put it at the bottom is that I used a smaller beam not a 150mm. So that will give me the same Z clearance as a 150 beam. So if I run a short suport from the table suport to the bottom of the side beam then that will take care of the vibration( right?).
Thanks ken for your in put but you will understand now wwhy I say it wil bow as I am using a 100mm beam.
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  #13  
Old Wed 17 July 2013, 11:37
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The worst bending of the side beams is horizontal, when the y-axis has to reverse direction rapidly. Try cutting some text (letters) and you will be amazed to see all the shaking (probably consider adding diagonal braces on the legs as well)
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  #14  
Old Wed 17 July 2013, 11:41
paulus
Just call me: paul
 
jhb
South Africa
Ok will do thanks gerald. Who will give a number for my small machine.
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  #15  
Old Wed 17 July 2013, 11:50
paulus
Just call me: paul
 
jhb
South Africa
Gerald I want to cut a product called( trespa) it is a resin board what will you sugest as cutting speed and feed and the bit to use if you can help. Thanks
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  #16  
Old Wed 17 July 2013, 13:01
paulus
Just call me: paul
 
jhb
South Africa
Here is a better view of my mini mm Alberton-20130716-00949_1.jpg

Alberton-20130716-00947_1.jpg
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  #17  
Old Wed 17 July 2013, 13:35
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
Send a message via Skype™ to Alan_c
Your main beams on the sides are upside down, the long edge (that the rail is supposed to be fixed to) is at the bottom and the shorter edge is at the top, the reason they are done like this is to maximise the length of beam under the rails, the way you have them is of no benefit so you could have just cut them straight...
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  #18  
Old Wed 17 July 2013, 13:46
paulus
Just call me: paul
 
jhb
South Africa
Ok that is what you mean. I cut them longer so that I can do it the other way around. It just looks better to me if it is this way round.
Thanks for your comments I am starting to understand why the mm is design the way it is. Talking about that who did design it?
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  #19  
Old Wed 17 July 2013, 14:03
darren salyer
Just call me: Darren #101
 
Wentzville mo
United States of America
In response to post #14, I think with some logos applied, it would certainly qualify for a #.
Enjoy using it.
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  #20  
Old Wed 17 July 2013, 14:07
paulus
Just call me: paul
 
jhb
South Africa
Good will make a plan to get it on asap thanks.
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  #21  
Old Wed 17 July 2013, 16:31
swatkins
Just call me: Steve
 
Houston
United States of America
Gerald designed the MM !

How about a close up of the Y car !
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  #22  
Old Wed 17 July 2013, 21:35
KenC
Just call me: Ken
 
Klang
Malaysia
Paul,with such a short span, even 50mm C channel can take a few tons without problem...
Lately, I did a stress analysis on a pin supported 1200mm span 50x100x5mm Channel, I get 0.01mm deflection at the middle of the span with point load of 10kN.
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  #23  
Old Wed 17 July 2013, 22:43
swatkins
Just call me: Steve
 
Houston
United States of America
Is the Y car in the top pictures a scaled down version?
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  #24  
Old Wed 17 July 2013, 23:11
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Ken, my gut feel is that your beam calc is not correct. Maybe 10x greater deflection? (I havn't calculated these things for a long time)
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  #25  
Old Thu 18 July 2013, 00:02
KenC
Just call me: Ken
 
Klang
Malaysia
I'm surprised too... but the point is we all over design excessively... even if I made mistake on 1 decimal point because we trusted our eye too much LOL!!!

The reason for my simulation was to convince a client/friend that there are no need to replace the 50x100mmx5mm thk sheet metal channel beam to a 6". BUT THAN AGAIN, for the sake of indulging his visual/psychological satisfaction, I went with 6"x2" since he is paying the extra

Last edited by KenC; Thu 18 July 2013 at 00:07..
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  #26  
Old Thu 18 July 2013, 00:02
paulus
Just call me: paul
 
jhb
South Africa
To respond to steve, yes it is scaled down it was not easy but I got it done. How ever I need to increas the motor mounting plate thikness to 3mm. And I think what you guys call the Y car I call the X car I made it out of one piece bend the sides and not welded.
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  #27  
Old Thu 18 July 2013, 00:06
KenC
Just call me: Ken
 
Klang
Malaysia
This is a genuine Mini MM
Great job!
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  #28  
Old Thu 18 July 2013, 00:11
paulus
Just call me: paul
 
jhb
South Africa
Just want to thank gerald for a great design proudly south african. I am also glad to see not all the great minds have left the country. This machine must be strongly premoted in sa so that the cnc world can be turnd on its head in this country every guy wants to get rich quick on cnc and over charge.
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  #29  
Old Thu 18 July 2013, 00:37
paulus
Just call me: paul
 
jhb
South Africa
Thanks ken will see how it hold up will keep you guys posted.
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  #30  
Old Thu 18 July 2013, 13:43
paulus
Just call me: paul
 
jhb
South Africa
Hi all.
Can any one help with this.
I have picked up a constant buzzing noise on one of my motors any idea as to what it can be? It is not very loud.
Thanks
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