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Thumbweight Blends - Thumbweight Blends
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Jol  
#1 Posted : Tuesday, October 24, 2017 6:25:06 AM(UTC)
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Presumably a 'thumbweight blend' with a 'bulge' of 1 is like a regular blend (with no lead-in)

is that right ?

So a value of 1.2 might represent a blend with a nice little lead-in ?

In metric - the default seems to be to a bulge of 0.394 .. so every blend, you need to o adjust it to 1

1 seems to be a good default - agreed ?

Incidentally 0.394 x 2.54 = 1 ... So this should be easily fixed for us metric folk

There is also some conflict between he values stated in the topbar and in the inspector - presumably this is part of the same issue ?

Any thoughts ?

Thumbweight blends are an awesome addition by the way - and I hope it's possible in the future that they extend to 'by position' variable blends !!
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Jol  
#2 Posted : Tuesday, October 24, 2017 6:32:24 AM(UTC)
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Looking for logic in all the wrong places !

.. another question

- if a thumbweight blend has a radius of say 10mm and a thumbweight of 1 - I guess it's still a 10mm radius

but

- if a thumbweight blend has a radius of say 10mm and a thumbweight of 2 - I guess it's no longer a 10mm radius, correct ?

Same question for a Curvature Continuous Radius blend - I guess a 10mm CC blend doesn't have a radius of 10mm ... is that right ? Or does it hold a minimum radius of 10mm and blend out from there ?

Sorry to be pedantic - but I want to understand this !
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Tim Olson  
#3 Posted : Tuesday, October 24, 2017 11:27:37 PM(UTC)
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Checking....
Tim
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Tim Olson  
#4 Posted : Wednesday, October 25, 2017 1:58:42 PM(UTC)
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>>Presumably a 'thumbweight blend' with a 'bulge' of 1 is like a regular blend (with no lead-in)

Yes, a bulge factor of 1 should approach the shape of a constant radius blend. The bulge factor is a scale multiplied to the start/end tangents.

The bulge factor should be unitless. In 1355 and earlier, it was actually getting applied as a unit value. This is now corrected in 1356.

Small values 0.0001 approach the shape of a chamfer.
Values near 1 approach arc
Large values approach a sharp corner.



>>>If a thumbweight blend has a radius of say 10mm and a thumbweight of 2 - I guess it's no longer a 10mm radius, correct ?

Yes, that is my understanding. The 10mm provides some starting conditions including offset distance from shared edge.


>>Same question for a Curvature Continuous Radius blend - I guess a 10mm CC blend doesn't have a radius of 10mm ... is that right

Yes, that is my understanding. The shape changes from an arc should be very small, but it is no longer an exact arc. I'm not sure if it is a minimum radius.

Reading through the acis docs for thumb weights, they mention an option for G2 Thumbweights, I'll look into that further.

Tim

Edited by user Wednesday, October 25, 2017 10:06:29 PM(UTC)  | Reason: Not specified

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Nick R  
#5 Posted : Thursday, October 26, 2017 2:10:22 AM(UTC)
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Tim,
Thumbweight blend is the most welcome feature of version for me. Please look at G2 Thumbweight blends.

Nick
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Jol  
#6 Posted : Thursday, October 26, 2017 5:11:57 AM(UTC)
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I'm not sure ifs ACIS has got this far yet ... but continuity from a variable value (position) blend would be most welcome !!
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Tim Olson  
#7 Posted : Thursday, October 26, 2017 9:00:53 PM(UTC)
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>> but continuity from a variable value (position) blend would be most welcome !!

Kinda there, but limited to edge types so far. Needs further exploring....

Attached image has a g2 variable blend applied on left compared to g1 variable blend on right.

Like Nick, I really like the idea of g2 thumb weight which might let the designer control the curvature graph a bit by tweaking the bulge factor...no luck with that one yet...

Tim

Edited by user Thursday, October 26, 2017 10:56:40 PM(UTC)  | Reason: Not specified

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Guest  
#8 Posted : Friday, October 27, 2017 6:02:23 AM(UTC)
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Quote:
Like Nick, I really like the idea of g2 thumb weight which might let the designer control the curvature graph a bit by tweaking the bulge factor...no luck with that one yet...


OK - I'm misunderstanding something.

I thought that the idea of a 'thumbweight' blend - (originating presumably from the days when a mold-maker would literally manually blend a radius into a surface) - was that it did have continuity from a given driving surface, the influence of which can be controlled by this very bulge factor ?
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Jolyon  
#9 Posted : Friday, November 10, 2017 1:52:40 PM(UTC)
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Thumbweights Blend - In b1355 ... there is still no coordination between the value input boxes in the topbar and the value input boxes in the Inspector ... this sometimes makes your shiny new blend hard to adjust.

As with other tools, the values in the topbar need to sync with the values in the Inspector window
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