using hydrometer how to get glaze consistency right
Posted 03 January 2013 - 10:34 AM
Posted 03 January 2013 - 11:59 AM
I use my well water as thats my supply source of all water-but tap water is fine.
As far as the hydrometer wet it 1st always before use in clean water and then use when wet-or you can always use it dry but it must be dry every time-I use mine wet as it easier than drying ever dip.
Many of my glazes are tuned in around 1600-1550-1520. That should be a starting point.
The cup is filled to a given line or full and the time it takes to empty is recorded-(time this with a accurate timer)
I have only used the cup with slip so someone else can elaborate.
Posted 03 January 2013 - 03:37 PM
Posted 03 January 2013 - 04:11 PM
If you have a hydrometer, I would start there and test your glazes from 1.3 sp to 1.6 sp.
Your dipping times will vary depending on absorbency of the bisque ware (porosity and thickness)
Fast Hawk Pottery
Posted 03 January 2013 - 05:22 PM
May depend on the size of the hole in the cup . . . bet there is no standard.
Posted 04 January 2013 - 12:38 AM
Posted 04 January 2013 - 01:17 PM
Get a plastic 100ml graduated cylinder (usually under $5). Weigh it on your gram scale. Make an appropriate tare weight or just write the mass of the cylinder on the base with sharpie.
Stir glaze well and fill the cylinder with 100 ml of glaze. Weigh the whole kit and kaboodle. Either use the tare weight or subtract the weight of the cylinder.
The remaining weight in grams is the SG once you move the decimal 2 places left (ie 145gr =1.45SG)
My 2 cents.
Posted 04 January 2013 - 04:05 PM
The hydrometer and the paint pot are both good simple ways of measuring the viscosity of your glaze. However, the thinness or thickness of the glaze isn't dependent upon strictly the amount of water that it has in it. It is also important to know if your glaze is acidic or base, and it's good to know how to adjust the situation with that glaze. One of the clearest explanations of this situation is a You Tube video by John Britt. Here is the address for this video. I'm sorry that I haven't figure out yet how to actually post a link within the text. So here it is, just copy and paste this to your browser and you should be able to get there. http://www.youtube.c...=em-subs_digest
I hope this helps.
Posted 05 January 2013 - 12:49 AM
You can order a 250ml glass cylinder from Amazon for a few bucks. With that you only have to take out a little glaze and you can use your hydrometer. You only need little over 200ml to do it. If the glaze is particularly viscous just tap the side until the hydrometer quits sinking. Your results should be fairly reproducible.
Posted 06 January 2013 - 01:09 AM