Thanks Matt,matt miller said:Maybe it's a grounding problem. When I built my UV box, I had trouble with starting as well. ( (there was a url link here which no longer exists) ) I installed a metal reflector behind the bulbs and it did the trick.
Thanks Kerik, I have read the thread Matt pointed me to and it seems this is the problem. I used a nice, white piece of masonite behind the bulbs.... duh.Kerik said:Bill,
You need some type of metal 'reflector' behind the bulbs...
!!!! Great idea Kerik!Kerik said:Bill, if you haven't left for Homely Depot yet, you can try covering your white masonite with aluminum foil. That might do the trick. If your foil has a shiny and matte side, apply it with the matte side facing the bulbs.
Kerik said:Bill, if you haven't left for Homely Depot yet, you can try covering your white masonite with aluminum foil. That might do the trick. If your foil has a shiny and matte side, apply it with the matte side facing the bulbs.
Oh yes Sandy... this has been done. I have now returned from the depot, cut my sheet metal to fit and run a wire from it to the ground as well. Works like a charm.sanking said:I am going to assume that you also grounded all of the lights together with the green ground wire, and that you have this going to the outlet? If not, I would highly recommend you do this, both for more consistent start-up and for safety reasons.
Another simple solution for this is to run a bare heavy guage copper wire accross the top of the tubes connected to the ballast(s) ground. I've made three units this way and it works great!billschwab said:Oh yes Sandy... this has been done. I have now returned from the depot, cut my sheet metal to fit and run a wire from it to the ground as well. Works like a charm.
Thank you everyone! Now I want a bigger one...
Bill
PS. Don... come on over when ready, the second one is always better.
Thanks Don! I actually tried that with the ground wire I had cut to attach to the reflector before installing the metal figuring it might work as well. It did work great. I will keep it in mind for the next one I build.donbga said:Another simple solution for this is to run a bare heavy guage copper wire accross the top of the tubes connected to the ballast(s) ground. I've made three units this way and it works great!
donbga said:Another simple solution for this is to run a bare heavy guage copper wire accross the top of the tubes connected to the ballast(s) ground. I've made three units this way and it works great!
billschwab said:Oh yes Sandy... this has been done. I have now returned from the depot, cut my sheet metal to fit and run a wire from it to the ground as well. Works like a charm.
Thank you everyone! Now I want a bigger one...
Bill
PS. Don... come on over when ready, the second one is always better.
Sandy,sanking said:Better go ahead and build the bigger one now before you forget all the things you just learned. I built two smaller units before finally realizing that it would be an enriching experienice to have a unit made from 48" tubes.
Sandy
My thoughts exactly.sanking said:...before finally realizing that it would be an enriching experienice to have a unit made from 48" tubes.
donbga said:Sandy,
Where do you get paper long enough to use that size UV printer?
That makes sense in your case.sanking said:Don,
I am not actually using the large UV printer to make big prints. The main advantage is that it allows me to expose several prints at the same time. With the 48" length, for example, I can easily expose three or four fairly larege prints at the same time. This is important for me since with my carbon printing I make thick tissue that require very long exposures. Being able to expose three to five prints at the same time is tremendous saving of time and energy.
Sandy
mark said:What are the over all dimensions of a box that size, Sandy? Damn thing has to be really freaking big, if I am visualizing it right.
donbga said:That makes sense in your case.
My interest is to make long panos from stitched digital negs. Pictorico is supposed to be releasing 13 inch OHP in rolls this year and I want to print some images about 36 inches long. I'll look at paper suppliers for sizes. I pretty sure some papers come in 40-42" sheets.
Another simple solution for this is to run a bare heavy guage copper wire accross the top of the tubes connected to the ballast(s) ground. I've made three units this way and it works great!
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