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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Smoothing a rough hole--suggestions?
I've got a passage in a die head that I need to smooth up.
Looks like it was drilled and nothing further was done to it. Material is hardened P20. Hole is 18mm straight with a through length of 12-13 inches. I need to get the inside smooth/polished with no visible surface pits. scratches, drill marks etc. Estimate I'll have to open it up 10-15 thousandths to get below the worst of the grooves. Hole goes through, but I only have 1 1/2" clearance on the back end, so everything has to be done from one end. Final diameter, concentricity, straightness and taper aren't important. I would actually like it to finish with a slight taper, smaller at the rear. Mounted points, followed by Cratex and then polishing compound on a felt bob? Expanding carbide reamer first to get it smoothed up a bit? Flex-Hone and a brass lap? Thanks, Bill |
#2
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Smoothing a rough hole--suggestions?
BillM wrote:
I've got a passage in a die head that I need to smooth up. Looks like it was drilled and nothing further was done to it. Material is hardened P20. Hole is 18mm straight with a through length of 12-13 inches. I need to get the inside smooth/polished with no visible surface pits. scratches, drill marks etc. Estimate I'll have to open it up 10-15 thousandths to get below the worst of the grooves. Hole goes through, but I only have 1 1/2" clearance on the back end, so everything has to be done from one end. Final diameter, concentricity, straightness and taper aren't important. I would actually like it to finish with a slight taper, smaller at the rear. Mounted points, followed by Cratex and then polishing compound on a felt bob? Expanding carbide reamer first to get it smoothed up a bit? Flex-Hone and a brass lap? Thanks, Bill Ream as smooth as you can then go at it with on of those hone brushes (looks like a bottle brush but with small abrasive balls on each bristle) powered by an air drill or equivalent. For final finish use a 'butterfly rod' which is nothing more than a 1/4 rod with a saw kerf splitting the end for an inch or so, into that slit place a length of folded length wise abrasive cloth, power the 'butterfly rod with a die grinder for higher RPM. Use progressively fine grades of abrasive cloth to desired finish. At least that's what I'd try.... Regards Paul -- ----------------------------------------- It's a Linux world....well, it oughta be. ----------------------------------------- |
#3
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Smoothing a rough hole--suggestions?
I had good luck using a suitable lap and a range of lapping compounds to do
something not totally unlike what you want to do "BillM" wrote in message news:zpj7j.1090$W27.69@trndny09... I've got a passage in a die head that I need to smooth up. Looks like it was drilled and nothing further was done to it. Material is hardened P20. Hole is 18mm straight with a through length of 12-13 inches. I need to get the inside smooth/polished with no visible surface pits. scratches, drill marks etc. Estimate I'll have to open it up 10-15 thousandths to get below the worst of the grooves. Hole goes through, but I only have 1 1/2" clearance on the back end, so everything has to be done from one end. Final diameter, concentricity, straightness and taper aren't important. I would actually like it to finish with a slight taper, smaller at the rear. Mounted points, followed by Cratex and then polishing compound on a felt bob? Expanding carbide reamer first to get it smoothed up a bit? Flex-Hone and a brass lap? Thanks, Bill -- Posted via a free Usenet account from http://www.teranews.com |
#4
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Smoothing a rough hole--suggestions?
--Google on "Flexhone".
-- "Steamboat Ed" Haas : Whatever happened Hacking the Trailing Edge! : to Tom Nelson? www.nmpproducts.com ---Decks a-wash in a sea of words--- |
#5
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Smoothing a rough hole--suggestions?
How about an old fashioned brake cylinder hone?
-- Peter DiVergilio Most of the money I've wasted was mostly spent trying to impress people who were never going to like me anyway! |
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