Re: Low cost RP concept model making device

From: Delft Spline Systems (
Date: Tue Jun 23 1998 - 18:57:19 EEST

Dear Michael and group:

I posted:
>> ...
>> Please do also consider using CNC based RP systems for concept
>> modelling. These are cheaper by far, and offer a free choice between
>> speed and accuracy. Which type is better (LMT or CNC) depends on the
>> type of model that you need: LMT is best for small, geometry with many
>> inner details (thin walled), CNC is best for styling block models (solid).
>> ...

Michael reacted:
>I have studied 3 axis-5 axis machining searching for this less expensive
>way to accomplish what you describe. I have not found that for my
>application (highly convoluted and complex sculpture) that machining is
>cheaper or faster. A couple of 5 axis job shops have even recommended
>that I build my parts with SLA (can you imagine what a 6' sla sculpture
>would cost? ouch.) ...

As far as I see we do indeed agree: you are using complex geometry in
the sense of 'containing many inner details', which is not
easy to mill.
I did recommend CNC milling only for styling block models:
geometry without undercuts, which may be complex in the sense of
'have a freeform shape'. For most product designs the impossibility to mill
undercuts is not a problem as these geometries need to be produced later

For you application where a large size is needed as well currently no
cheap solution is available.
For my type of application the lowcost desktop approach is feasible.


Lex Lennings.

Delft Spline Systems, The Netherlands.
We offer DeskProto: affordable Rapid Prototyping using CNC milling

For more information about the rp-ml, see

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