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Adjust the radius of arc with fixed end point
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* January 09, 2019, 02:23:09 AM
I found when changing the arc radius, the end points also move. In another CAD software I can change the radius with end point fixed. Is it possible in TurboCAD?

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TurboCAD Pro Platinum 2019 64-bit


* January 09, 2019, 02:31:07 AM
#1
I have never liked the way arcs edit  in TC. If I know I am going to need to adjust the radius as you described I use a polyline.

You could try constraints but I find the extra effort isn't worth it.

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Nikki
TC20 platinum
TC 2015 platinum
TC 2017 with lightworks


* January 09, 2019, 03:09:13 AM
#2
How to use poly to draw and adjust an arc?

This is what I think a better way to edit arc
https://youtu.be/BbsxvV_Yp5o?t=30

The current way of arc edit is pretty useless, it is even faster to draw a new arc than edit it.
« Last Edit: January 09, 2019, 03:12:16 AM by Frederick Lm »

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* September 09, 2019, 08:49:18 PM
#3
How to use poly to draw and adjust an arc?

This is what I think a better way to edit arc
https://youtu.be/BbsxvV_Yp5o?t=30

The current way of arc edit is pretty useless, it is even faster to draw a new arc than edit it.

Any news from developer about the arc editing feature? Arc edit by adjust radius is still not exist in TC2019.

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* September 09, 2019, 10:06:37 PM
#4
You've always been able to do it with a new arc drawn 1,2, 3 or 1,3,2 and the necessity will depend on the use case.  I think that insisting that editing is preferable is generally ideological rather than practical.

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* September 09, 2019, 11:58:11 PM
#5
You've always been able to do it with a new arc drawn 1,2, 3 or 1,3,2 and the necessity will depend on the use case.  I think that insisting that editing is preferable is generally ideological rather than practical.

I want that feature for editing an existing arc, not drawing a new arc.

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TurboCAD Pro Platinum 2019 64-bit


* September 10, 2019, 02:04:42 AM
#6
Why?  What's the compelling advantage of editing an existing arc over creating a new one if the result is the same? 

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* September 10, 2019, 04:22:13 AM
#7
Why?  What's the compelling advantage of editing an existing arc over creating a new one if the result is the same?

Less mouse click and WYSIWYG if I can modify the existing one. Otherwise I have to delete the current one and select the appropriate arc tool to create a new one. And the current arc editing is not very useful.
« Last Edit: September 10, 2019, 04:26:47 AM by Frederick Lm »

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TurboCAD Pro Platinum 2019 64-bit


* September 10, 2019, 08:05:37 AM
#8
Draw a short line and have it maybe a different color just to distinguish it from other things. Anchor constraint the end point of the line where the arc begins. Coincident constraint the arc to said line. Now you can change radius in selection pallet or you can grab the furthest away corner grab handle and move it around for a wysiwyg. Constraints are simple to do but you just have to play with them.

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* September 10, 2019, 09:58:18 AM
#9
TCad seems to offer no simple way to perform what should be a simple task.

Henry H

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* September 10, 2019, 10:50:21 AM
#10
While the method I described allows you to see the arc change and only from one side, it doesn't let you grab a side of the arc and snap it to something else which would be very handy. However if you attach a small line on the other end of the arc and coincident constrain the line to it and then move the reference point of the line to the connection vertex between said line and arc, you can then grab the "line" and move it to any point and snap it which moves the arc end to the exact same point since it is coincident to the same vertex.

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* September 10, 2019, 12:04:28 PM
#11
The "Power Stretch" tool might work here, but I find that it doesn't snap properly.

Frederick Lm Arc Problem

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John R.

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* September 10, 2019, 02:36:01 PM
#12
If you apply the "Auto Dimension" Constraint to the arc, its radius can be edited in the Variables palette.

Henry H

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September 10, 2019, 02:52:35 PM
#13
If you apply the "Auto Dimension" Constraint to the arc, its radius can be edited in the Variables palette.

Henry H

To achieve what the original poster was requesting, I believe-- if one were to use Constraints-- one would have to insert an Object, such as a Point Object, at both the Arc's start and finish points, and use Points Coincident Constraints at those points; then use Fix Geometry Constraints on each of those Point Objects.
So as to force the program to move the Center Point of the Arc when changing its Radius via the Variable Palette, after having inserted a Radius Dimension Constraint.

Lots of work.  Better just to re-insert it as Murray supported, or use a Polyline arc segment, as Nikki said she sometimes does.
« Last Edit: September 10, 2019, 03:05:23 PM by Alvin Gregorio »

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Alvin Gregorio
(mostly Residential Architectural 2D; no formal CAD Training; intermittent TurboCAD user since yr. 2000 [ver6.5])
---TurboCAD: V21PP; V20.2PP; V19DL; V11.2Pro; Windows-7-Pro/64-bit; Intel-Core-i3 CPU; 2.27ghz; 4GB RAM; Intel HD Graphics (CPU based)


* September 10, 2019, 03:34:22 PM
#14
Or make an arc PPM maybe ??, then you should be able to set the refpoint to whatever side you want.
It will be a 2 step thing, insert the PPM arc in to the drawing and then move it to correct position, after that adjust it as you please.

Torfinn

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* September 10, 2019, 03:52:21 PM
#15
The video that Frederick referred to shows an arc being edited in a way in which TC's start, end, included arc can achieve the same end, or a polyline arc as Nikki proposed.  I just can't imagine a use case in which editing an existing arc in a drawing with AC grips is superior to drawing a new arc with TC's existing tools, not just different.   Frederick's claim of "fewer clicks" is completely dependent on how familiar and consequently efficient a user is with either app, and disregards the circumstances that would bring you to have to edit the arc that way.   No arc is sitting alone in a drawing waiting to be edited, what's its context relative to other entities?   

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* September 11, 2019, 03:52:03 AM
#16
I found when changing the arc radius, the end points also move. In another CAD software I can change the radius with end point fixed. Is it possible in TurboCAD?

See attached video .
I think what you want is to use the "arc segment" polyline.

« Last Edit: September 11, 2019, 03:55:09 AM by Dean »

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September 11, 2019, 05:27:21 AM
#17
I think you would have to know the chord of the arc and the height of the arc that you want it to be.
Select the Arc. Set the reference point to the fixed point of the circle, than just tab into the x and y fields and enter
the dimensions. The only problem you have is finding a handy dandy arc calculator that you can put on your desktop. ;>)

Edit: Or get over it and move on. If the program won't do it, do something else to achieve what you're looking for. End Edit.
« Last Edit: September 11, 2019, 06:01:05 AM by Cliff2 »

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* September 11, 2019, 07:39:05 AM
#18
I see, yes arc segment is what I am looking for.

Thank you!  :D

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