Search found 26 matches

by Matfie
Mon Sep 17, 2018 8:04 pm
Forum: QCAD Suggestions and Feedback
Topic: Cycloid and Involute curves for gears construction
Replies: 2
Views: 1117

Re: Cycloid and Involute curves for gears construction

There is a paper, here http://web.mit.edu/harishm/www/papers/involuteEWC.pdf which describes the use of splines for approximating an involute curve in CAD systems. I think the approximation would be pretty close for the range of curve that is used in a gear for example, not sure about an extended le...
by Matfie
Fri Dec 29, 2017 8:06 pm
Forum: QCAD 'How Do I' Questions
Topic: Copies And Layers
Replies: 2
Views: 1069

Re: Copies And Layers

You can nest blocks, eg have two 1. Back View (draw the outline) 2. Front View (insert Back View, plus the lines you want in addition) then insert Back View and Front View into your drawing and they will show differently. If you change Back View, then the outline portion of Front View will also change
by Matfie
Thu Dec 28, 2017 9:25 am
Forum: QCAD Troubleshooting and Problems
Topic: [solved] Print Preview views are reversed
Replies: 3
Views: 1560

Re: Print Preview views are reversed

Hi I reported this in the bugtracker before: http://www.qcad.org/bugtracker/index.php?do=details&task_id=1518 I agree that technically the program may be acting logically... but the UI is not technical it is for people. Landscape means that the page you see is wider than it is high, not that the att...
by Matfie
Thu Dec 21, 2017 3:04 pm
Forum: QCAD 'How Do I' Questions
Topic: Etching HO Scale Balconey Rails
Replies: 12
Views: 1617

Re: Etching HO Scale Balconey Rails

Hi it seems to me that you are drawing two lines (one for each side of the bar) and trimming all the intersections away then doing a fill? why don't you just draw single lines (one for each bar, in the centre position of the bar) then adjust the width of the lines to be the width of the bar. that wo...
by Matfie
Mon Dec 18, 2017 9:52 pm
Forum: QCAD Troubleshooting and Problems
Topic: Text Box dimensioning
Replies: 0
Views: 2775

Text Box dimensioning

Hi I came across a strange problem. I was using Autodesk Fusion 360 software for 3D modelling at work. (this is free for educational use and is fairly easy to learn). Fusion 360 has the possibility of creating drawings directly associated with the 3D model which is nice and I was using this to produ...
by Matfie
Fri May 12, 2017 10:36 am
Forum: QCAD 'How Do I' Questions
Topic: Easy Glass & CRL
Replies: 4
Views: 2014

Re: Easy Glass & CRL

Are you using QCAD to produce the DXF file? If so, you can very likely simply change the color of your layer(s). perhaps its worth adding, that as QCAD is a mighty fine free and open source CAD program, it can of course be used to edit the DXF file and save it again, eg: use CRL to generate your DX...
by Matfie
Mon Apr 10, 2017 8:01 am
Forum: QCAD 'How Do I' Questions
Topic: Arc joining question
Replies: 4
Views: 1857

Re: Arc joining question

I don't think you can draw it directly with a polyline, since you would have to guess the middle point (guessing is bad) but you could draw it like that and convert to a polyline.. however, moving the points will not necessarily do what you want, since the attribute "tangentially connected" will not...
by Matfie
Sun Apr 09, 2017 9:47 am
Forum: QCAD 'How Do I' Questions
Topic: Arc joining question
Replies: 4
Views: 1857

Re: Arc joining question

is there actually a requirement that the line terminating at point A is at any particular angle? (ie Husky has made it tangential with the blue line forming the point of A, but you didn't explicitly state that as a requirement..) If you don't have a requirement to terminate at any angle, then I woul...
by Matfie
Wed Mar 15, 2017 9:31 pm
Forum: Introduce Yourself
Topic: Hi from Bucks, UK
Replies: 2
Views: 3910

Re: Hi from Bucks, UK

Hi (from south west UK) how did you enlarge the text in the dimensions? In Edit / Drawing Preferences -> Dimension / Dimension Settings you can change the Text Size, and changing this also changes the arrowhead size in that drawing .. to change it for all (new) drawings, you can do the same in Appli...
by Matfie
Sun Feb 19, 2017 10:28 pm
Forum: Chat
Topic: How to create Wobble geometry
Replies: 1
Views: 4809

Re: How to create Wobble geometry

do you need to do it once, or many times? It is basically a point on a circle which is rotated as it is moved along. If you need to do it only once (or few times), you can do it as follows: 1. draw a dot at the start point, and select it 2. choose the 'Move and Rotate' tool from the Modify menu 3. T...
by Matfie
Tue Feb 14, 2017 10:03 am
Forum: QCAD 'How Do I' Questions
Topic: [solved] How to adjust the grid snap
Replies: 7
Views: 991

Re: How to adjust the grid snap

I think you have a conceptual error .. perhaps this will help. Obviously, it is not possible to place a rectangle on a point since the rectangle is bigger than the point. What you are doing is picking up the rectangle with a handle and placing that handle on the point! So, if you need to place objec...
by Matfie
Wed Dec 21, 2016 10:32 am
Forum: QCAD 'Script Add-On & Plug-in challenge' - Work in Progress
Topic: generating gear part
Replies: 17
Views: 11045

Re: generating gear part

I created such a file with a couple of functions, but it shows up in the library browser as a non useable part.. is there a way to prevent that?
dump.png
dump.png (18.01 KiB) Viewed 6367 times
Hm ok, if I use a different extension eg 'common.ecma' then it doesn't show up.. would that be the best way?
by Matfie
Tue Dec 20, 2016 8:53 pm
Forum: QCAD 'Script Add-On & Plug-in challenge' - Work in Progress
Topic: generating gear part
Replies: 17
Views: 11045

Re: generating gear part

the little yellow triangle means that the script failed to produce an icon, and the lack of anything in the drawing means that the script failed to produce an object to insert I find that when that happened, there would be an error message on the terminal that I ran qcad on; I don't know how to make...
by Matfie
Tue Dec 20, 2016 8:15 pm
Forum: QCAD 'Script Add-On & Plug-in challenge' - Work in Progress
Topic: generating gear part
Replies: 17
Views: 11045

Re: generating gear part

just as any other part I think you can double click on the 'InvoluteSpur' gear icon and it will open the options window (or single click to select it, and click the 'insert object' arrow at the bottom of the library browser window..) if you then move the mouse pointer to the drawing you will see a p...
by Matfie
Tue Dec 20, 2016 6:42 pm
Forum: QCAD 'Script Add-On & Plug-in challenge' - Work in Progress
Topic: generating gear part
Replies: 17
Views: 11045

Re: generating gear part

Sure, and I will keep working on it for a while too I want to generate an internal ring gear at least, and also this script does not handle undercutting at all - in fact I don't know how to calculate that as in the real world the hobbing tool just does that automatically but it weakens the gear, and...

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