1 Topic by Heartlander

  • Heartlander
  • Heartlander
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  • From: Kent from Kansas City
  • Registered: 2013-06-23
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Topic: Pls help. How to realign edges to same height?

I'm using Sketchup 2013 (SketchUp Make) and I'm learning but certainly still dependent on my friend's expertise here.

Imagine I'm drawing a hexagonal cylinder. I can't get the top to form a face, they all looked fine, no edge gaps.

I increased the precision of the tape measure out to three decimal places and, using the Label tool like a GPS measurement, now see that the wall is actually jagged.

Some of the intersections heights are 6.50MM, some are 6.547MM, some are 6.499MM, etc. Was this variance allowed because the Tape Measure (and I suppose everything elses' precision was set so loose? How to prevent this?

More to the point, is there a global way to reset the wall heights to 6.500MM? Like Select, Set Global Height, or something. A plug in maybe.

You see, the hexagon is actually a complicated part with many walls and would take hours to measure, delete, redraw all the points, then check everything one point at a time to ensure they are the same height.

As always, thank you for your help and advice.

Robox printer, HICTOP (Prusa i3 variant) Model 3DP17 printer, ELEK 2.5W laser engraver, AutoDesk 123D Design, Windows 10

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2 Reply by Heartlander

  • Heartlander
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Re: Pls help. How to realign edges to same height?

Maybe use a Grouped cutting plane?

Robox printer, HICTOP (Prusa i3 variant) Model 3DP17 printer, ELEK 2.5W laser engraver, AutoDesk 123D Design, Windows 10

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3 Reply by mconsidine

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Re: Pls help. How to realign edges to same height?

Assuming I understand correctly, the attached images should show the process of making a hexagonal cylinder.
1 : select the polygon tool and draw it to one of the dimensions needed.
2 : do the same for the second dimension, using the same origin
3 : select the inner area and delete it
4 : select the push/pull tool and extrude it to the height you need.

Hope this helps,
Matt

PS  The first image should have had the radius measured along an axis.  This was corrected in the second image.  Doubt many would notice ...

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4 Reply by Heartlander

  • Heartlander
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Re: Pls help. How to realign edges to same height?

Hello Matt. I wasn't quite clear in my post. The hexagon was just used as an example of a part with many edges around the top. So, never mind that.

Attached is a clip of the actual part with the Labels showing the heights from the bottom plane. I was specifying 6.5MM all around when I built it and couldn't figure out why I was having trouble faking a face.

Then it occurred to me to check the Precision (under Windows>Model Info>Units). When I ran precision out to three decimals places, I could see some of the 6.5's were really 6.547's or 6.549's. Crap!

So now I'm thinking I need to
1) make a big Rectangle,
2) make it a Group so nothing sticks to it,
3) Move it onto the top of the part and lower it to 6.500MM,
4) Intersect Lines (with Model),
5) delete the square (the "cutting plane") and
6) delete the little trimmings it knocks off the tops of edge that stuck up above 6.500MM.

Does that sound right? Hopefully this is clearer than my octagon example.

I also included the part drawing itself (in SU 8 format) if that helps. Thanks for your help.

Kent

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RH-25MMBatts-with cover1 (SU Vers 8).skp 1.62 mb, 2 downloads since 2013-08-06 

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5 Reply by mconsidine

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Re: Pls help. How to realign edges to same height?

I'm just seeing your reply after being out of town for a week or so.  Lemme take a look a bit later and get back to you ...
Matt