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Parametric pulley belt

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250GBOX

Parametric pulley belt

Hi Everyone

I am new to Openscad and would like some help please

I have downloaded a file from Thingiverse, ( parametric pulley belt ) which allows various timing belt profiles and sizes to be created, the problem is that each time I use the program no teeth appear on the belt and a pin or pulley is in the centre, the issue is with line 110, I have tried and failed to rectify this

Any ideas ?

250GBOX

Vince

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OpenSCAD mailing list-2

Re: Parametric pulley belt

There's a July entry in the comments that might provide some value:

No teeth showing problem (openscad 2019.05). I seem to have got round this by changing the non-specified variable 'pulley_b_ht' in line 110 to 0 and remove the -1. This doesn't seem to cause any problems for me so far.

It's not my comment and I've not tested it.

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

Any ideas ?

250GBOX

Vince

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OpenSCAD mailing list
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250GBOX

Re: Parametric pulley belt

Thanks, tried that but did not solve the issue

Regards

250GBOX

Vince

From: Discuss <[hidden email]> On Behalf Of fred via Discuss
Sent: Wednesday, October 7, 2020 9:23 AM
To: OpenSCAD general discussion <[hidden email]>
Cc: fred <[hidden email]>
Subject: Re: [OpenSCAD] Parametric pulley belt

There's a July entry in the comments that might provide some value:

It's not my comment and I've not tested it.

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

OpenSCAD mailing list-2

Re: Parametric pulley belt

In reply to this post by 250GBOX

Now that I've tested it, there's a new error with the change recommended from the comment. Line 184 has a parameter in the module call reading "width = width + 2" which is not supported in OpenSCAD. I removed the plus two and it works, but I think all the similar modules will have to be corrected in this manner.

The link to the model: Parametric Pulley Belt by Vivalize

Parametric Pulley Belt by Vivalize

Open this design up in Customizer to get started! I needed a belt to go along with droftarts's fantastic paramet...

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

OpenSCAD mailing list-2

Re: Parametric pulley belt

In reply to this post by 250GBOX

I erred in my correction as well. I changed "width = width + 2" to "width" alone.

Doing so changes the entire result's dimensions. The creator doesn't appear to monitor his creation and/or doesn't care to correct the programming errors.

If you're still having complications, more specific information would be helpful.

On Wednesday, October 7, 2020, 4:28:13 AM EDT, Vince Yeoman <[hidden email]> wrote:

Thanks, tried that but did not solve the issue

Regards

250GBOX

Vince

There's a July entry in the comments that might provide some value:

It's not my comment and I've not tested it.

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

250GBOX

Re: Parametric pulley belt

Thank you

I will try this

250GBOX

Vince

From: Discuss <[hidden email]> On Behalf Of fred via Discuss
Sent: Wednesday, October 7, 2020 9:31 AM
To: OpenSCAD general discussion <[hidden email]>
Cc: fred <[hidden email]>
Subject: Re: [OpenSCAD] Parametric pulley belt

I erred in my correction as well. I changed "width = width + 2" to "width" alone.

Doing so changes the entire result's dimensions. The creator doesn't appear to monitor his creation and/or doesn't care to correct the programming errors.

If you're still having complications, more specific information would be helpful.

On Wednesday, October 7, 2020, 4:28:13 AM EDT, Vince Yeoman <[hidden email]> wrote:

Thanks, tried that but did not solve the issue

Regards

250GBOX

Vince

There's a July entry in the comments that might provide some value:

It's not my comment and I've not tested it.

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

lar3ry

Re: Parametric pulley belt

In reply to this post by OpenSCAD mailing list-2

OpenSCAD mailing list-2 wrote
> Now that I've tested it, there's a new error with the change recommended
> from the comment. Line 184 has a parameter in the module call reading
> "width = width + 2" which is not supported in OpenSCAD. I removed the plus
> two and it works, but I think all the similar modules will have to be
> corrected in this manner.
> The link to the model: Parametric Pulley Belt by Vivalize

The variable 'width' detemines the width of the teeth, which (I think)
should be the width of the belt as well.

Here's a little tip for you. Place a # character on any line you want to
highlight, and it will be shown in preview as a semi-transparent light red.
The beuaty of this is that the part highlighted will be shown in its
entirety, even if it it is changed later, say by a difference().

So, scroll down to line 184.
Change it to:
# linear_extrude(width)

Preview will show you what the teeth will look like.
This will show the right thing.

Change the line to read
# linear_extrude(width-1)

Change the line to read
#linear_extrude(width+5)

Preview will show you what's happening.

Bottom line is that you need to make it
linear_extrude(width)

--
Sent from: http://forum.openscad.org/

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JordanBrown

Re: Parametric pulley belt

In reply to this post by OpenSCAD mailing list-2

On 10/7/2020 1:27 AM, fred via Discuss wrote:

"width = width + 2" which is not supported in OpenSCAD.

That's not *entirely* accurate.

It's OK *if* there is a "width" at a broader scope and there is not yet a "width" in the current scope.

That is, this is no good:

width = 1;
width = width + 2;

but this is OK:

width = 1;
echo(width);
if (true) {
    width = width + 2;
    echo(width);
}
echo(width);

BUT it will print 1, 3, 1, not the 1,3,3 you would expect in another language. The "width=width+2" in the middle creates a new "width" that only lasts until the end of the "if".

I've used this for patterns like

module some_round_thing(r, d) {
    r = r ? r : d/2;
    d = d ? d : r*2;
    echo(r=r, d=d);
}

some_round_thing(r=1);
some_round_thing(d=2);

to let you specify either the radius or the diameter. Both calls echo r=1,d=2.

I haven't looked at this specific program to see if its usages falls into this case.

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250GBOX

Re: Parametric pulley belt

In reply to this post by OpenSCAD mailing list-2

I have tried this but still have the same issue

From: Discuss <[hidden email]> On Behalf Of fred via Discuss
Sent: Wednesday, October 7, 2020 9:28 AM
To: OpenSCAD general discussion <[hidden email]>
Cc: fred <[hidden email]>
Subject: Re: [OpenSCAD] Parametric pulley belt

The link to the model: Parametric Pulley Belt by Vivalize

Parametric Pulley Belt by Vivalize

Open this design up in Customizer to get started! I needed a belt to go along with droftarts's fantastic paramet...

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

image004.emz (2K) Download Attachment

Gadgetman!

Re: Parametric pulley belt

Hi!

That width = width +2 thing is some of the worst coding I've ever seen, mine included!

The creator has put a variable assignment statement inside the parameter list of a function!

you only put the stuff that goes on the righthand side of the '=' there.

It's like writing LS_Width_parameter = width = width+2

Have you tried using 'width + 2' in there?

Trygve

Den 9. oktober 2020 kl. 09.02.34 +02.00 skrev Vince Yeoman <[hidden email]>:

Hi

I have tried this but still have the same issue

From: Discuss <[hidden email]> On Behalf Of fred via Discuss
Sent: Wednesday, October 7, 2020 9:28 AM
To: OpenSCAD general discussion <[hidden email]>
Cc: fred <[hidden email]>
Subject: Re: [OpenSCAD] Parametric pulley belt

Now that I've tested it, there's a new error with the change recommended from the comment. Line 184 has a parameter in the module call reading "width = width + 2" which is not supported in OpenSCAD. I removed the plus two and it works, but I think all the similar modules will have to be corrected in this manner.

The link to the model: Parametric Pulley Belt by Vivalize

Parametric Pulley Belt by Vivalize
Open this design up in Customizer to get started! I needed a belt to go along with droftarts's fantastic paramet...

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

I have downloaded a file from Thingiverse, ( parametric pulley belt ) which allows various timing belt profiles and sizes to be created, the problem is that each time I use the program no teeth appear on the belt and a pin or pulley is in the centre, the issue is with line 110, I have tried and failed to rectify this

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

_______________________________________________
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[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

250GBOX

Re: Parametric pulley belt

Hi Tryve

Thanks for your help, I will try that

Vince

From: Discuss <[hidden email]> On Behalf Of [hidden email]
Sent: Friday, October 9, 2020 8:47 AM
To: OpenSCAD general discussion <[hidden email]>
Subject: Re: [OpenSCAD] Parametric pulley belt

Hi!

That width = width +2 thing is some of the worst coding I've ever seen, mine included!

The creator has put a variable assignment statement inside the parameter list of a function!

you only put the stuff that goes on the righthand side of the '=' there.

It's like writing LS_Width_parameter = width = width+2

Have you tried using 'width + 2' in there?

Trygve

Den 9. oktober 2020 kl. 09.02.34 +02.00 skrev Vince Yeoman <[hidden email]>:

Hi

I have tried this but still have the same issue

From: Discuss <[hidden email]> On Behalf Of fred via Discuss

Sent: Wednesday, October 7, 2020 9:28 AM

To: OpenSCAD general discussion <[hidden email]>

Cc: fred <[hidden email]>

Subject: Re: [OpenSCAD] Parametric pulley belt

Now that I've tested it, there's a new error with the change recommended from the comment. Line 184 has a parameter in the module call reading "width = width + 2" which is not supported in OpenSCAD. I removed the plus two and it works, but I think all the similar modules will have to be corrected in this manner.

The link to the model: Parametric Pulley Belt by Vivalize

Parametric Pulley Belt by Vivalize

Open this design up in Customizer to get started! I needed a belt to go along with droftarts's fantastic paramet...

On Wednesday, October 7, 2020, 4:16:32 AM EDT, Vince Yeoman <[hidden email]> wrote:

Hi Everyone

I am new to Openscad and would like some help please

I have downloaded a file from Thingiverse, ( parametric pulley belt ) which allows various timing belt profiles and sizes to be created, the problem is that each time I use the program no teeth appear on the belt and a pin or pulley is in the centre, the issue is with line 110, I have tried and failed to rectify this

Any ideas ?

250GBOX

Vince

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

_______________________________________________

OpenSCAD mailing list

[hidden email]

http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org