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Post by hummingbirdstones2 on Mar 10, 2022 21:06:13 GMT -5
Starguy - According to Robin, the groove is usually centered in the middle of the girdle. That would mean raising your grinder die to whatever height would be needed to center it in your girdle. That's why I commented on "doing some math" for the setup.
The die on ours cuts ~1.25mm groove. A .004" feeler gage for clearance above the .032" bar centers the groove (roughly) for a 3mm girdle height.
If your bar is .024" (~0.6mm) it will be easier to maintain clearance between the top of your bar and bottom of your die than it is on the one I made.
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Post by Starguy on Mar 10, 2022 21:40:41 GMT -5
hummingbirdstones2Our groove bit is 1.6 mm Brand new. I’ve got a couple feeler gauges. I’ll be sure to have one handy when I try this thing. Thanks for all your help. I’m sure it saved me making some mistakes. I’ve got a nice digital caliper that seems to be pretty accurate. It will come in handy for calculating where the middle of the preform is.
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Post by jasoninsd on Mar 10, 2022 22:11:13 GMT -5
hummingbirdstones2 Our groove bit is 1.6 mm Brand new. I’ve got a couple feeler gauges. I’ll be sure to have one handy when I try this thing. Thanks for all your help. I’m sure it saved me making some mistakes. I’ve got a nice digital caliper that seems to be pretty accurate. It will come in handy for calculating where the middle of the preform is. You can also just get down eye-level with the table and see where center is on the girdle...then tighten the bit when you've got it centered. It's going to be just as accurate as marking the center with something, then trying to get the center of the edge of the bit dead center of your marked centerline. (That's a lot of centers! LOL) |
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Post by hummingbirdstones2 on Mar 11, 2022 9:35:56 GMT -5
No marks. Once the baseline calcs are done for your typical girdle height it's down to grabbing different feelers if you change the girdle height. Last step is always eye-balling it to make sure it looks good, right?
Starguy - the 1.6mm cut on your die only leaves 0.7mm either side on a 3mm girdle. Maybe a good thing you mentioned thick slabs earlier, eh?
I think the experienced groove wrappers on here might have talked about thicker girdles in other threads. I don't wrap, so can't really remember.
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Post by jasoninsd on Mar 11, 2022 9:46:24 GMT -5
No marks. Once the baseline calcs are done for your typical girdle height it's down to grabbing different feelers if you change the girdle height. Last step is always eye-balling it to make sure it looks good, right?
Starguy - the 1.6mm cut on your die only leaves 0.7mm either side on a 3mm girdle. Maybe a good thing you mentioned thick slabs earlier, eh?
I think the experienced groove wrappers on here might have talked about thicker girdles in other threads. I don't wrap, so can't really remember.
All this talk about groove wrapping...I brought out my Gryphon last night. Put a groove into a Mexican Moss with a 2.91mm girdle. It was fine until I put the wire in. Chipped the crap out of the back of the cab up by the bail. Any "sideways" pressure away with the wire on the cab when the girdle is that thin - and it's gonna chip. |
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Post by jasoninsd on Mar 23, 2022 16:22:17 GMT -5
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Post by liveoak on Mar 24, 2022 7:02:47 GMT -5
Unfortunately those bits on Rio are for a larger shaft than my Inland grinder takes.
Most of these type of grinders have a 5/16" shaft, and Rio's are for a 3/8".
They do have a nice selection of grits though, so maybe a bushing could be had to adapt them.
I've yet to try cutting a groove, but I was able to buy a 2 pack on Amazon - but they are only available in 220 grit. Guess I have to see how that works.
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Post by jasoninsd on Mar 24, 2022 9:26:51 GMT -5
Unfortunately those bits on Rio are for a larger shaft than my Inland grinder takes.
Most of these type of grinders have a 5/16" shaft, and Rio's are for a 3/8".
They do have a nice selection of grits though, so maybe a bushing could be had to adapt them.
I've yet to try cutting a groove, but I was able to buy a 2 pack on Amazon - but they are only available in 220 grit. Guess I have to see how that works.
CRAP!! I don't know how I missed the shaft size!! Thanks for catching that! I just called Rio Grande first thing this morning...they hadn't shipped it yet, so I was luckily able to cancel the order. Whew! I owe you one Patty!  |
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Post by liveoak on Mar 24, 2022 9:30:42 GMT -5
Actually I just had my husband find a bushing that I can buy so I could adapt it to the 5/16" shaft . It cost .94 cents at McMaster Carr - but you have to drill a hole for the set screw to go through. No big deal & it opens up all these other grits to use on the inland or gryphon.
So it's not a deal breaker if the other grits are useful.
I'm going to try my 220 hopefully tonight after work & see what I think .
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Post by liveoak on Mar 25, 2022 6:00:32 GMT -5
Obviously all of you already cutting grooves know this- but for the record I'll say:
I fired up my inland grinder last night to try out the groove cutting bit I got on Amazon. It's 220 grit, and I think it works fine. I cut a groove in a piece of Bloodstone with no difficulties, and no chipping.
Was quicker to do then I thought.
So I'm sticking with the Twofers , which are the best price by far.
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Post by liveoak on Mar 25, 2022 9:16:37 GMT -5
I forgot to add that these bits are 1 mm thick, and seemed just right for 20 gauge wire.
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