CSYS_MM_PART_DEF Issue

[FY_10378206]

Hello,

I made a part using Creo's Sheet metal with image below.

When I create an STL file and send it to our 3D printer, it makes it under millimeter only. Typically, it always ask if i want to convert to inches. When i load it into the 3D printer, it comes out super tiny and small. the problem here isn't the 3D printer, but the part itself.

Even though i change the properties to inches/lbm/seconds. it still causes the same issue 

I have a big feeling it has something to do with this axis below causing this issue:

If i build it from a solid model, it doesn't have this issue. I need to build this part under sheet metal, because it will become a sheet metal.

Please help.

thank you PTC community

[MartinHanak]

Hi,

my suggestion:

• open original model, which has set mm as lenght units
• measure some distance in the model, for example length of some edge
• convert length units to inch

• measure the same distance
• compare two measurements ... what is the result ?

[FY_10378206]

Hello,

I've came to realize it maybe be the template that's setup; I am unsure. when changed also, it doesn't allow it. its only when i create in sheet metal. I am clueless as of now.

[tbraxton]

Post a test model here for review. There are many things that might cause the issue you are describing. If you are not able to post a model here, then open a case with PTC support.

[FY_10378206]

NOTE - The part i created below is mm/g/sec

1. I create a basic square at H266.70mm(10.50") X W101.70(4.00") X T1.52(0.06"). 

2. After, I convert it to inches/lbm/seconds.

Results it would shrink the size of the square.
Below is MM

After converted

Result of change

In comparison

[FY_10378206]

I've also come to realize. My Creo isn't converting the units. 

When i create the part, Standard is in mm. I would convert it to inches and start building a basic square. When i dimension it as a "mm" rather inches (even though i already converted the part to inches), it would come out correct in the 3D printer. this is actually really odd. Has anyone ever experience this?

Thank you All

[MartinHanak]

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@FY_10378206 wrote:

I've also come to realize. My Creo isn't converting the units. 

When i create the part, Standard is in mm. I would convert it to inches and start building a basic square. When i dimension it as a "mm" rather inches (even though i already converted the part to inches), it would come out correct in the 3D printer. this is actually really odd. Has anyone ever experience this?

Thank you All

---

Hi,

your reply is related to sheetmetal part which does not contain any solid geometry. In this case you:

• create new part in mm
• change model length units to inch
  • Note: the model does not contain any dimension
• add solid geometry ... all dimensions use inch as length unit

Your previous reply is related to sheetmetal part which does contain some solid geometry. In this case you:

• create new part in mm
• add solid geometry ... all dimensions use mm as length unit
• change model length units to inch
• I guess your problem is related to Custom system of units

Please do following test:

• create new sheetmetal part
  • do not use your template
  • use PTC template named mmns_part_sheetmetal_abs
• add solid geometry ... all dimensions use mm as length unit
• change model length units to inch
  • do not use your Custom system of units
  • use PTC system of units named inch lbm Second (Creo Parametric Default)
  • use Convert option
• apply Regenerate
• apply Refit
• show model dimensions

If my test produces correct model, then the problem is related to your Custom system of units.

SUGGESTION: Upload your start model. This enable me to use it in my test.