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About Rockhopper

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    Southwest Ohio

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  1. Rockhopper

    Oil based "plasticine" clay recipe

    Not necessarily. 10W-30 motor oil is designed to be '10 weight' when cold, and gradually increase to '30 weight' (thicker) as it gets warmer. (The idea is that a lower viscosity helps the car crank easier when it's cold). I don't know the temperature at which the viscosity changes - but since your recipe calls for heating it, you may find it becomes too thick just about the time you think it would be getting thinner. Also - in addition to concerns about prolonged skin contact, any petroleum-based substance (motor oil, automotive grease, parafin) can give off some pretty nasty fumes when heated. Sounds like something you definitely want to do outdoors.
  2. Rockhopper

    Questions about slip casting

    The company I linked to (Saint Gobain) is a very large, international company. Their website displays contact info based on the country you select... When I selected 'Netherlands', it shows 'Patrick Lesch' - with an email address and phone number. I would suggest sending him an email and ask if there is a distributor in your area. PS - I have no connection with this company - just selected them as an example because I know they are a European based supplier.
  3. Rockhopper

    Questions about slip casting

    Looks like your plaster is what is known in the US as 'Plaster of Paris' or 'Casting Plaster'. The "moulding shapes and figures" on the label refers to pouring the plaster into a mould (usually rubber or alginate) to make figures, that are then painted. It tends to be somewhat soft and easily damaged - especially when it gets wet - so probably not a good choice for slip-cast moulds that you want to use more than once or twice. Look for something called 'Pottery Plaster' (for example: https://www.saintgobainformula.com/product/pottery-plaster), that's formulated specifically for the purpose.
  4. Rockhopper

    Questions about slip casting

    What if you make your mold so it sits on its side ? Then your pour opening could be in the area that's going to get cut away.
  5. Rockhopper

    Cone 5 Speckled Glaze

    Your picture definitely looks like a 'plain' white glaze over speckled clay... This may be too speckled for you, but Coyote's "Oatmeal" is a commercially available glaze that fits the description of white with brown speckles. The pic is a set of cat food/water bowls made with Standard's 112 (speckled brown) clay, so some of the larger spec's are from the clay, but it should give you a good idea of what it looks like at ^5. (Unfortunately, since it's a commercial glaze, I have no idea what they put in it to create the specks.) this mug is same glaze on a white stoneware - also at ^5
  6. Rockhopper


    Did you have witness cones on the shelves, to know what cone was actually reached ?
  7. Rockhopper


    Seems odd that there is very little, if any, on the bottom shelf but a fair amount on the kiln floor - and it looks like some of what's on the floor is actually under where that bottom shelf was. Just curious: Are the shelves ALWAYS used with the same side up - or are they sometimes flipped ?
  8. Rockhopper

    Shimpo Bantam Carbon brushes

    Look for an electric motor repair shop in your area, and take them the old brushes and/or the motor - it it's a decent size shop, they'll probably have some in-stock that will work. Another option: If you haven't already, take a close look at the motor housing to see if there a plate with info on who made the motor, then search on-line for "brushes for _(fill in the maker)_ DC motor" A basic search for "carbon brushes for DC motor" turned up this company, that seems to have a pretty extensive catalog. (I don't know anything about them, and have never bought from them - just sharing the result from a google search.)
  9. Rockhopper

    Firing Stoneware and Max Temp advice

    The Orton cone-chart show 1260C as anywhere from ^7 to ^9, depending on climb rate. (As discussed in many threads throughout the forum, there's more to 'Cones' than final temperature.) There are plenty of readily available stoneware clay bodies (and commercial glazes) that are ^5 to ^6. The Orton chart shows ^6 from 1185C to 1243C. If you don't already have a kiln, the price is 'right' on this one, and you have (or have access to) ^5-^6 clays, the 1260C max shouldn't be a problem. On the other hand, if you're looking to use 'high fire' (^10) stoneware, this kiln would work for for bisque firing - but you'll need something else for glaze.
  10. Rockhopper

    Gluing finished pieces together?

    Are you looking to turn it into a solid block - or do you want to have air-space around the mugs (I'm picturing a pile of mugs that looks like they're randomly stacked - and could fall over at any moment). If the latter is anywhere close to your intent, 2-part epoxy (JB Weld is one brand, PC-7 is another) is probably your most versatile option. Most common color is gray, but you can also get white or clear - just make sure it's UV resistant if you want it to last a while. Also: if you've got a lot of mugs to join, mix the epoxy in small batches & do a few at a time - otherwise the epoxy might set before you've put them all together, and then you'll have an 'epoxy rock' to add to your art. Either way, forget 'super-glue' it doesn't fill gaps - so only works well on smooth surfaces that fit tightly together.
  11. Rockhopper

    Electric quote seem fair?

    Not sure what you're referring to as 'Romex'. While it's commonly used (much like Kleenex or Band-Aid) as a generic term for 'Non-metallic (Type NM) sheathed wire', it's actually a brand-name. It's also, as far as I know, never been sold empty, as the 'sheath' fits very tightly around the wires - like the outer jacket on an extension cord. Perhaps you're thinking of flexible conduit (either metal or non-metallic) ? Depending on size, that can be purchased empty (sometimes by the foot, sometimes only in packages) - or, usually in shorter 'pigtail' lengths, with the wire already in it.
  12. Rockhopper

    Electric quote seem fair?

    One might find a 4-prong "range cord" used on a single-phase 220v kiln, with the neutral not used, so it will plug into an existing 4-wire outlet that was originally installed for an electric range - typically a 40 or 50 amp circuit. I worked in a 'big-box' home center in the '90s, when the US electrical code started requiring 4-wire outlets for new installations. Probably doesn't happen as much these days - but we sold a lot of 4-wire pigtails to people who were moving into a new (or newly renovated) home, and taking a range or dryer they brought with them from their older house. Even though the appliance only used 3 of the 4 wires, it still had to plug into a 4-wire outlet.
  13. Sorry, but the inner engineer in me compels me to point out that multiplying by 1.12 gives you an opening 12% bigger than the finished opening... which is not the same as a finished opening that's 12% smaller than the original. With 12% shrink, your finished opening is 88% of the original (100% - 12%). If you make it 11.2", and it shrinks exactly 12% - your finished size will be 11.2 x .88 = 9.856. Since 'Finished' = .88 x 'Make', you would divide your desired finished size by .88 to arrive at the 'Make' size. ('Make' = 'Finished' / .88.) So... to arrive at a 10" finished size: 10" / .88 = 11.36" (or, for a 4" opening to fit the corks in question: 4" / .88 = 4.54" ) Obviously, at theses sizes, the difference is small enough that it's probably less than your margin of error in measuring - but if you're working on something a lot larger, it would become an issue.
  14. Rockhopper

    Repairing greenware

    In addition to "spooze" (mentione above) - there's a commercial product called APT-II (apt2products.com) that's sold for this sort of thing - but, as they say "results may vary". I've only tried it once - and it the piece still separated during the bisque firing. Depending on the size & shape of the brake, you may be able to smooth the edges with a damp sponge, then take some similarly sized additional 'bites' out around the rim, and smooth them as well, to make it look like an intentional design element. (Lots of folks are into 'modified' pottery)
  15. Rockhopper

    How to thicken a low fire matt glaze?

    Also looks like the glaze may have been 'drizzled' on - either by pouring, or with a bulb syringe.

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