During a recent workshop in Atlanta the topic of the Giffin Grip and trimming came up during lunch. Several attendees expressed their love for the Giffen Grip. I have a Giffin Grip and I too find it very useful. However, if the pot is not perfectly centered I find that trimming can be a little challenging. I explained that I sometimes use the Giffin Grip but that most times I use my foam bat for trimming. I received an email asking me how I made the foam bat. In case anyone else is looking for an alternative for trimming I'm posting the information here.
I went to a local cloth store and bought a couple of square yards of green half-inch this foam:
I cut the foam in the approximate shape of the bat - being careful to make it about an inch or two bigger than the bat. **You do NOT want to cut it too small**. I used a pressboard bat since I stopped using them some time ago for throwing (I found they warped when wet).
I sprayed a heavy coating of adhesive on the surface of the bat. I used standard adhesive that comes in a spray can (like spray paint) that you can get at Lowe's or Home Depot. I placed the cut-out foam on top of the bat and pressed down to ensure the entire surface of the foam mat was in contact with adhesive. I let that sit overnight. The next day I cut the foam with scissors to match the shape of the bat.
View from underneath:
View from above:
The lines you see on the foam are guides to help center. I used a Sharpie pen to do this. The bat was place on my wheel and I started it spinning at about the speed I use to center clay. I held my hand very steady (using my leg as a brace) and placed the pen on the foam bat near the center. After the first circle was complete I lifted the pen, moved it out approximately one-half inch and repeated the process until I reached the end of the foam. The centering lines have really helped and I highly recommend them.
I quickly discovered that I needed to trim pieces that were larger than the bat pictured above. While in St. Petersburg I stopped by The Highwater Clay store at St. Pete Clay and bought a large bat (3/4" thick by 22" wide). I used this bat to make a larger foam bat to trim. Here it is:
From the side showing the thickness...
Tips for centering your pot:
- I place the pot in the center of the bat and get it as close to the nearest marking as possible.
- I start the wheel turning very slowly and place my finger near the bottom of the pot.
- As the wheel head turns you will be able to judge how centered it is. Stop the wheel and adjust accordingly.
- Once centered push down on the pot to help stabilize it.
I can usually center a pot on the foam board in about 30 seconds. I like using it so much for trimming that I only use the Giffin Grip when I have to.
Good luck and I hope this explanation has helped!