Archive for the ‘Light Cure’ Category

Found the Timer

Posted: November 14, 2018 in Light Cure
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Update on the timer search:

While the response from the call-out here did not return anything from the lurking electronics gurus of the inter-webs, I was able to find a supplier here in the USA (Kentucky) able to make exactly what I needed. The company is called Curious Technology, and the individual that came up with the solution is Greg Cunningham.

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The Timer

Greg delivered a working prototype in two days and a quote for additional copies within a few hours of my reviewing and approving the sample. The costs did not include any tooling or engineering fees, or minimum order quantities, so I could not be happier.

Other details: Greg was able to eliminate the original requirement for a battery, as the timer has no need for an internal power to keep its programming. In this hyper quick process, I also changed the display from LCD to LED. It fits the application and the lighted display will be easier to see, so that was a good revision to the original spec.

preview

The timer’s location on the final product design. First article now being printed. The timer is activated by the light trigger switch, and counts up the number of seconds of exposure, for a ready reference by the operator.

Thanks to Greg at Curious Technology! If only all our problems and needs could be solved this quickly, from a domestic supplier no less.

There will be more work sent his way, as we work through other versions of this product.

SLA printing uses laser light to cure resin in a bath to generate 3D parts, one layer at a time. The finished parts are smooth, with finer detail than what can be accomplished using (Fused Deposition Modeling), which extrudes plastic that is deposited in layers to build a part on a build platform. However, SLA printed parts require post processing to make them usable, even for model creation. Each part required excess uncured resin to be cleaned away, usually in an alcohol bath. Further, to eliminate surface stickiness and improve overall strength, it is necessary to use light cure conditioning to complete the curing of the finished model.

For desktop printer owners, the search for an economical post-process light cure solution leads to low-cost solutions. One such solution is to purchase tape light strips. These are inexpensive and operate from simple low voltage power supplies. They can be purchased from e-bay for a few dollars, and proclaim high-efficiency and violet light. Most use a standard mid/low power 5050 LED package and deliver anywhere from 395 to 410nm of violet light.  Another approach, which we have attempted, is use of 5mm LEDs in arrays on a simple custom circuit board.

Before I go any further, I will state now that after extensive testing and experimentation attempting to discover a super-low cost light cure conditioning solution, none of the low-end, low power (more…)