Re: Milling and laser engraving on one machine June 21, 2017 02:51PM |
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Re: Milling and laser engraving on one machine June 23, 2017 03:32AM |
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Re: Milling and laser engraving on one machine June 23, 2017 03:56AM |
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Re: Milling and laser engraving on one machine June 23, 2017 09:15AM |
Registered: 7 years ago Posts: 142 |
Quote
o_lampe
Here's a little progress report:
I found the distance between 2040 extrusion and leadscrew is a bit too small for mgn12 rails. It would fit with a 0.5mm gap between sheetmetall and screw.
But that is with metric M10 leadscrews instead of 1204 ballscrews.
[attachment 95445 mgn12_too-close.jpg]
So I got "creative" and made a poor-mens linear rail from PETG. It runs pretty smooth, but it has definitely more wiggle in it than real carriers. Two of them in a wide distance made a tight and playfree ( for now ) carrier.
[attachment 95446 poor_mens_linear-rail-unten.jpg]
[attachment 95447 Y-Achse-sandwich.jpg]
Another part from PETG to clamp the M10 nut was designed and builds a sandwich for the sheetmetal bracket.
[attachment 95449 Y-Achse-seite.jpg]
The pulleys will increase torque, so I may be able to use two NEMA17 steppers for Y.
Furthermore I made a drill-aid for the spindle bracket.
[attachment 95448 spindle_bracket-drill-aid.jpg]
Re: Milling and laser engraving on one machine June 24, 2017 05:12AM |
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Re: Milling and laser engraving on one machine June 25, 2017 04:13AM |
Registered: 7 years ago Posts: 142 |
Quote
o_lampe
Here is another shot of the linear rail surrogate. It took a few tests to make it right. I hope it lasts long enough to mill my own brackets.
Good idea to drill the holes and let someone else cut the shape.
[attachment 95531 poor_mens_linear-rail-2.jpg]
Luckily the X-axis is able to run with real linear rails, because there are oval holes to adjust the distance between lead screw and extrusions.
Re: Milling and laser engraving on one machine June 25, 2017 01:38PM |
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Re: Milling and laser engraving on one machine June 26, 2017 09:32AM |
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Re: Milling and laser engraving on one machine June 26, 2017 11:24AM |
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Re: Milling and laser engraving on one machine June 26, 2017 11:29AM |
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Re: Milling and laser engraving on one machine June 27, 2017 02:55AM |
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Quote
Desertboy
Nice one will be interested to see how you get on with the epoxy
I'm not using fusion360 so need to work out my cadcam solution yet but I worry about putting the bits together now lol and my Z axis is still a vague plan lol. Once I finish the machine going to invest in a new pc as my decent one went bang and my cad program doesn't render properly on my old pc it's doing my head in but it's not a show stopper to being able to use it. A couple of hours in wireframe with this extrusion and you're heads hurting lol.
Interested to hear the spindle can run that low, be glad you got a water cooled spindle I was reading that if the spindle isn't spinning at least 6000rpm it won't spin the fan quick enough to cool the spindle head but with water cooled this isn't an issue.
Re: Milling and laser engraving on one machine June 27, 2017 03:45AM |
Registered: 7 years ago Posts: 142 |
Quote
o_lampe
If I'd try to construct the mill in CAD, I'd use simplified rectangular extrusions.
To be fair, the spindle doesn't like to work at 1Hz, cooling still is an issue with water, but way less than fan cooled. Also the inverter is at it's current limit.
Re: Milling and laser engraving on one machine June 27, 2017 12:11PM |
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Re: Milling and laser engraving on one machine June 27, 2017 12:32PM |
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Quote
o_lampe
I liked to play "mercenary" on my Amiga. It was a 3D-game with just a few vector lines, but it was incredible back then.Quote
I find wireframe is a zone when I was a kid on my Amiga
Re: Milling and laser engraving on one machine June 28, 2017 01:44PM |
Registered: 11 years ago Posts: 1,049 |
Re: Milling and laser engraving on one machine June 28, 2017 02:02PM |
Registered: 7 years ago Posts: 142 |
Quote
cozmicray
Hard for me to understand how this cast plastic trolley
is better than a circulating ball rider on a steel rail?
Your motor will expend all torque just over coming friction
What lube is good for plastic on aluminum?
Leadscrew to rail spacing could have been made to work.
Re: Milling and laser engraving on one machine June 28, 2017 02:16PM |
Registered: 7 years ago Posts: 142 |
Quote
VDX
... you'll get even better results, when mixing different grain sizes - so the finer particles can fill and "solidify" the spaces betweend bigger ones.
With other tests in a German CNC-forum they found volume percentages of 4% to 6% of the resin best ... but then you have to mix longer, to get all the sand particles wetted, so the connection will be best ...
Re: Milling and laser engraving on one machine June 29, 2017 03:06AM |
Registered: 8 years ago Posts: 5,232 |
Quote
cozmicray
Hard for me to understand how this cast plastic trolley
is better than a circulating ball rider on a steel rail?
Your motor will expend all torque just over coming friction
What lube is good for plastic on aluminum?
Leadscrew to rail spacing could have been made to work.
Re: Milling and laser engraving on one machine June 29, 2017 11:37AM |
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Re: Milling and laser engraving on one machine June 29, 2017 05:13PM |
Registered: 7 years ago Posts: 142 |
Quote
o_lampe
The deviation test of the sand/resin filled extrusion brought no difference!
It still sags 0.15mm with a 5kg weight.
Maybe the resin was too old ( +3 years ) or my test setup is wrong. Anyway, I leave the extrusions unfilled and get the machine running. There's always time to improve things later...
Re: Milling and laser engraving on one machine June 29, 2017 08:15PM |
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Re: Milling and laser engraving on one machine June 30, 2017 03:28AM |
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Quote
cozmicray
In first post - he has linear rail?
What is wrong with that rail?
Re: Milling and laser engraving on one machine June 30, 2017 03:47PM |
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Re: Milling and laser engraving on one machine July 01, 2017 03:19AM |
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Re: Milling and laser engraving on one machine July 01, 2017 03:48PM |
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Re: Milling and laser engraving on one machine July 05, 2017 03:56AM |
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Re: Milling and laser engraving on one machine July 08, 2017 05:51AM |
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Re: Milling and laser engraving on one machine July 09, 2017 02:01AM |
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Re: Milling and laser engraving on one machine July 09, 2017 03:53AM |
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Re: Milling and laser engraving on one machine July 25, 2017 05:32AM |
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