Dimensional Inspection Technique for a small Silicone Part

S

smimatt

#11
For inspecting small flimsy parts, I use a Micro-Vu video measuring system. As far as the part moving, you may want to study the print. If it is drawn to ASME Y14.5M-1994 standards, it may specify if inspection should be carried out in "free state variation" or a "restrained condition".
We are designing the part, putting the requirements on the drawing and determining the inspection method. (We are a small operation.) So we could put that it is to be inspected in a restrained condition (ie. within a template).

how many parts does your system call for inspecting now?
Can you get a sample the part(s) it sits on/between from your customer?
Our sampling plan calls out for 35 out of 1000 parts. We have the parts that they are assembled into and have tested them and found that they work.

Attached is a section of the part. (I could not show the whole part due to proprietary constraints.) We are looking to verify the radii called out and that is what changes when the parts are moved around.
 

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ScottK

Not out of the crisis
Staff member
Super Moderator
#12
We are designing the part, putting the requirements on the drawing and determining the inspection method. (We are a small operation.) So we could put that it is to be inspected in a restrained condition (ie. within a template).



Our sampling plan calls out for 35 out of 1000 parts. We have the parts that they are assembled into and have tested them and found that they work.

Attached is a section of the part. (I could not show the whole part due to proprietary constraints.) We are looking to verify the radii called out and that is what changes when the parts are moved around.
that certainly does not look like it lends itself to measuement.

If I was in your shoes I'd pursue the go/no-go option. Lay it on the customer provided part and if it fits then it's a go.

If you really want to measure you can always look into something like a Smartscope that does video measurement - no concerns about shadows like with a comparitor. Thing is you'll probably end up laying the piece on the mating part anyway to get the lay right.
But Smartscope are, like, $40k.
 
S

smimatt

#14
I appreciate all of this input. I will probably go with some type of template or go/nogo.

Thanks to you all.
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#15
I can inspect all those dimensions on the Micro-Vu. PM me if you need further details.
off topic -
Crash Not: do you use the video measuring system? Automated or manual?
How is it priced? I was pricing these systems about 6 months ago but did not get a quote or demo on the Micro-Vu.
 

Jim Wynne

Staff member
Admin
#16
Is this part molded or stamped?

If stamped, we use a "mylar template" to verify the tooling, which tells us the tooling is ok. Our customers have approved this method, when no other easy way seems to work. Other than making a fixture resembling the actual component the part is used in or a go/no go gage. Do I dare mention, we yet to have a problem with fit, form or function of any parts, using this method. :notme:

This is just an opinion........
In my experience, this is the best and least expensive method. You can do a one-time correlation between the hard tooling and sample parts, determine that they work in the assembly, and then monitor the tooling. You can, perhaps, just produce a 2D template that you can lay the part down on and line it up to determine whether the part can be formed to fit the template

Added in edit: If you do something like this, the drawing should specify the method, so that there aren't any peeing matches over block tolerances in future.
 
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S

smimatt

#18
In my experience, this is the best and least expensive method. You can do a one-time correlation between the hard tooling and sample parts, determine that they work in the assembly, and then monitor the tooling. You can, perhaps, just produce a 2D template that you can lay the part down on and line it up to determine whether the part can be formed to fit the template

Added in edit: If you do something like this, the drawing should specify the method, so that there aren't any peeing matches over block tolerances in future.
Thanks, this makes it much clearer for me.
 
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