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Showing results for tags 'dead spot'.
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So I had this problem for a while, and couldn't quite figure out what was happening. I ended up making a 'wiper' that would create a crater in the center of the puck before tamping, but this wasn't ideal and didn't always work to boot. Today I decided to try and fault find, and I swapped out the IMS screen I have in there for a bog standard e61 spot welded one, didn't really expect it to solve anything but was my first point of elimination. Anyway I locked in the PF and then remembered I hadn't flushed, pulled out the PF and when checking to see if the puck had got any water on it already I see... Shower screen indentation... bugger me that was the problem all along. The puck had been too close to the screen, so there hadn't been enough room for the water to form over the top of the puck, so it just went directly from screen to puck, missing out the 'blank' in the center and causing my dead spot. I was dosing 18g in a 18g VST, and going down to 17g gives a much better pour. I think this is also a symptom of when I began to tamp lightly, I found great benefit in that it was much easier to tamp evenly with a light tamp, and achieve the same light pressure each time, but being that the puck is larger it may well have been the root of my center dead spot. Anyway, lesson learnt.. onward.