pacificmanitou wrote:Looks like an excellent conversion, very nicely done. If I wasn't starting a single dose grinder project I would probably do that to my SJ. Do you find any problems using the static screen and guard plate? I removed those rather quickly from my grinder.
I used the mini electronic doser funnel for over a week without a screen while waiting for the rest of the parts and I found that the dose was very inconsistent even when weighing and grinding a single dose of beans at a time as more or less would fall out of the chute/throat each time I ground so my finished/ground weight would vary by as much as 3/4 of a gram even though I put the same weight of beans into the hopper each time.
I have not put the finger guard plate on yet and from what I have seen so far I doubt that I will. I thought I might need it as when I used the SJ with the funnel and no screen the grounds shot out across the funnel to the other side when the grind started and they seemed to be rather "clumpy" in consistency. I figured that the guard would break up the grounds as they exited the chute but with the screen on the grounds fall straight down and aren't "ejected" like they are without the screen. The "clumpyness" has gone down dramatically also with the antistatic screen in place.
From what I have seen so far the screen seems to be necessary to get a uniform dose as it holds back the grounds so that a consistent amount comes through (pushed out by the burr vanes/paddles). this is not an issue with the can type doser as you control the dose by the setting and how many times you pull through.
With the screen in, the grounds are held in the chute/throat and the weight consistency has gone down to .2 gram from grind to grind with a full hopper of beans.
The only draw back that I can see to retaining grounds in the throat/chute would be over night as the beans in there will stale up a bit but there is only a couple of gram in the chute so you can always grind for a second or so to clean out the old grounds and replace the chute/throat with fresh if you are worried about it.
I used the SJ for over a week with the mini electronic doser funnel and a piece of cardboard held in place with a tooth pick to cover up the open motor while I waited for all of the parts to get here so I did get a good idea of how it worked without the screen and I am sold on keeping the screen in now. Before I was not sure but now, no question (in my mind anyway).
Without the screen I got a lot of drop out of grounds when the grinder was sitting idle (grounds would fall out of the chute/throat onto the grinder plate and catch pan). With the screen I can say that, so far, I have not had any grounds fall out while the grinder is idle so it does hold grounds in the cute/throat
The SJ looked rather silly with cardboard and a toothpick on it but this gave me the opportunity to run it without an antistatic screen for enough time to see how it worked before trying it with the screen in place.