Skew ChiDAMN!!
27th September 2006, 06:41 PM
Knocked up another goblet today and, remembering another thread on problems with parting off goblets, decided to take a few pix to show my method of seperating. Of course, now I can't find the thread to post these pix in... :o Anyways, while turning it I decided to throw in a couple of captive rings to show the easy way to finish the inside of the rings as well. :)
Pic 1: You can see I've finished one ring and taped it out of the way. The thicker part of the stem is the section I've just seperated the loose ring from... I cut a strip of sandpaper (240 grit, I think) about 2cm" wide and long enough to wrap around the stem 1 1/2 times. A bit of tape sticks one end to the goblet stem and I simply wrap the rest around; the flap unwinds and "sticks out" when the lathe is turned on again, but as soon as the ring is fed over it, it wraps itself around the stem again. Very, very simple.
Pic 2: Using the above setup. You need to constantly keep the ring moving to avoid flat spots. Errrm... looking at that photo I think I was actually doing the next step: polishing the inside of the ring. Instead of using s/paper, I wrap a piece of cloth in the same way and put a dob of shellawax on it. Exactly the same way of doing things though. :)
Pic 3: Sparting off... these are the pix I was going to post in the other thread. I lost one pic, which showed the setup when I rounded the blank but before I turned the goblet. :o But this pic shows how much room I leave for seperation... and as you can see, I use a 5mm parting tool, not a "thin blade." ;) The first pic should've shown that trench at the width it is now (2 cuts wide = 1cm) but only a few mm deep, just so I know where the bottom of the foot can start. This pic was taken to show how I start seperating: I cut a few mm deep on one side of the trench, then swap to the other side and cut it a few mm deep, etc., etc. The shallow trenches stop the parting tool from jamming.
Pic 4: And here's the main reason I do a "double-cut" instead of just "one and a bit." You can see I've enough room to angle the parting tool, so I can put a slight hollow on the inside bottom face of the foot. This not only looks better, when finished, but the goblet will stand better on "not quite flat" surfaces than if I'd just parted it off squarely. :)
Pic 5: Finished. Terrible pic, innit? [sigh] Have I said lately that I hate my camera?
Pic 1: You can see I've finished one ring and taped it out of the way. The thicker part of the stem is the section I've just seperated the loose ring from... I cut a strip of sandpaper (240 grit, I think) about 2cm" wide and long enough to wrap around the stem 1 1/2 times. A bit of tape sticks one end to the goblet stem and I simply wrap the rest around; the flap unwinds and "sticks out" when the lathe is turned on again, but as soon as the ring is fed over it, it wraps itself around the stem again. Very, very simple.
Pic 2: Using the above setup. You need to constantly keep the ring moving to avoid flat spots. Errrm... looking at that photo I think I was actually doing the next step: polishing the inside of the ring. Instead of using s/paper, I wrap a piece of cloth in the same way and put a dob of shellawax on it. Exactly the same way of doing things though. :)
Pic 3: Sparting off... these are the pix I was going to post in the other thread. I lost one pic, which showed the setup when I rounded the blank but before I turned the goblet. :o But this pic shows how much room I leave for seperation... and as you can see, I use a 5mm parting tool, not a "thin blade." ;) The first pic should've shown that trench at the width it is now (2 cuts wide = 1cm) but only a few mm deep, just so I know where the bottom of the foot can start. This pic was taken to show how I start seperating: I cut a few mm deep on one side of the trench, then swap to the other side and cut it a few mm deep, etc., etc. The shallow trenches stop the parting tool from jamming.
Pic 4: And here's the main reason I do a "double-cut" instead of just "one and a bit." You can see I've enough room to angle the parting tool, so I can put a slight hollow on the inside bottom face of the foot. This not only looks better, when finished, but the goblet will stand better on "not quite flat" surfaces than if I'd just parted it off squarely. :)
Pic 5: Finished. Terrible pic, innit? [sigh] Have I said lately that I hate my camera?