JavaProp to Mastercam

[WouterSU]

Hello,

I would like to get my propellor design into a cnc machine.
To do this i tried to export from javaprop to a .dfx file.
I opened it with Solidworks (made a new part)

But Solidworks won't show the prop as a solid body, but surfaces.
And I need a solid body to export it to mastercam.

Does anyone know how to do this?

[Guest625101138]

I generate blade sections in Excel and import them as offsets into Delftship. From there I can produce igs files that are suitable input for milling software.

If you are making a water prop you need to understand what you are doing with Javaprop to get something that works well.

What is your application - thrust and speed?

Rick W

[WouterSU]

Hey Rick,

It is a water prop.
It is for a solar powered boat.
For a cruise speed around 13.5km/h --> 3.75m/s
at that speed we need 1050Watt
Max diameter is 0.4 meter.

I followed the instructions from JavaProp and I think I have the highest efficiency now. Don't know for sure.

But I realy want to get it done by mysel f.So I hope you can explain a bit.

Wouter

[Guest625101138]

Wouter
I checked the blade dxf output for JavaProp and it looks fine. I have attached an image of what I can see from the JavaProp generated file. There is also a test.dxf file of that blade. This blade roughly fits your requirement but is only done as sample.

I have also attached an igs file of a prop that I have had milled. I do not do any of the tool pass software.

The props I have had milled have been in aluminium and the machine shop uses quite coarse tool passes and then burnish the end result by hand. It took the shop a few attempts to work out how much extra metal to leave so they could achieve the finished size to my measurement.

JavaProp will produce a reasonable prop for your application.

What efficiency is it showing?

The only concern will be that the blades are strong enough to take the thrust. You will see that I thicken the blades up quite a lot in the root to take the bending load.

Rick W

[WouterSU]

Hello,

Actually the problem is to get the blade from JavaProp to a solid body in Solidworks (or a good IGES file).

The file you attached is a solid body when I open it in SolidWorks.
When I save the javapropfile as a .dxf file, and open it in SolidWorks I get a lot of sketches and surfaces... But no solid body.

How do I get a solid body?
With another program?
You told about Delftship. Can I export from Javaprop to Delftship?

I hope you can help me.

Wouter

[Guest625101138]

The test.dxf I posted before was produced directly from the on-line version of JavaProp from here:
http://www.mh-aerotools.de/airfoils/javaprop.htm
I did not do any additional manipulation. You should be able to do the same thing.

There are some versions of JavaProp on the web or something you have downloaded that may have glitches. I always use the mh-aerotools site to make certain I have the latest.

If you cannot get a useful dxf file send me the JavaProp settings you have and I will generate the blade from my computer.

Rick W

[WouterSU]

I can create the DXF file too (good ones) , but you have a solid IGES file.

And the step from the DXF file to a solid body, thats my problem right now..

I attached my dxf file.

Wouter

[Guest625101138]

Wouter
I generated the igs file I posted from Delftship but this was not done from using JavaProp to start with. I generate offsets from an Excel file that I import into Delftship.

Delftship is no good for you as it will not import the dxf file.

You need a converter for dxf to igs. I thought I had a CAD file that would do it but I do not have one loaded that accepts both types. What CAD files have you got?

I also tried to generate an iges file from JavaProp but it is only sections not solid - I guess you have already tried this.

If you cannot find a converter I can do a prop design from scratch for your application.

Looking at you blade it seems very slender. Have you checked the bending stress in the blades at the root? They will flex a lot.

Rick W