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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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Setting Lathe compound at precise angle, a Real Keeper!!!
I just summarized a recent post for myself, so I can add it to my own
"machining hints" notebook. This one is one of those real keepers, as far as I am concerned. Thanks to the original poster and the guys who answered him. Pete Stanaitis. The Question: I'd like to try to turn some short tapers with a lathe. I'd be interested in suggestions on how to set a fairly precise angle. Answers: 1. If you have a sample of the taper needed: You start with a piece with that known taper mounted in the lathe and centered. Then you mount a dial test indicator in the toolpost and crank the compound rest back and forth watching the needle (indicating the taper, obviously). When the needle doesn't move, you have matched the taper. 2. If you don't have a sample of the taper needed: Fairly precise? With the engraved numbers on the cross slide. Preciser? With a cylindrical round in the chuck, a dial indicator on the compound and feeding a known distance with the compound. The rest is math. 3. If you don't have a sample of the taper needed: A guy I used to work with had a sine bar that had a base which was mounted between centers. The actual sine bar was hinged. I think he held the gage blocks and all together with rubber bands. I suppose he used a dead center under pressure to keep everything from moving. |
#2
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Setting Lathe compound at precise angle, a Real Keeper!!!
spaco wrote:
I just summarized a recent post for myself, so I can add it to my own "machining hints" notebook. While you are collecting taper-tips: When taking off the taper from an existing one, it is important, that the dial indicator's tip is at center height. If it is just off by 1% (heightwise of the centerline, relative to the diameter), the error will be about 3% in diameter. When I had to make a collet holder for ER collets, I took off the taper from a collet. Therefore, I turned some bar with two lands with exactly the same diameter. Slipped the collet over it and took off the taper with a dial indicator. The bar looked like this (if my explanation was hard to understand) (only one half shown): ######################## - collet ######################## +-----+ +-----+ | +------------+ | | | -- . --- . --- . --- . --- . --- CL HTHL (hope that helps later), Nick |
#3
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Setting Lathe compound at precise angle, a Real Keeper!!!
On Aug 5, 12:50 pm, Nick Mueller wrote:
spaco wrote: I just summarized a recent post for myself, so I can add it to my own "machining hints" notebook. While you are collecting taper-tips: When taking off the taper from an existing one, it is important, that the dial indicator's tip is at center height. If it is just off by 1% (heightwise of the centerline, relative to the diameter), the error will be about 3% in diameter. When I had to make a collet holder for ER collets, I took off the taper from a collet. Therefore, I turned some bar with two lands with exactly the same diameter. Slipped the collet over it and took off the taper with a dial indicator. The bar looked like this (if my explanation was hard to understand) (only one half shown): ######################## - collet ######################## +-----+ +-----+ | +------------+ | | | -- . --- . --- . --- . --- . --- CL HTHL (hope that helps later), Nick Thank you both I just printed this post to act as a simple quick reference for me. Brent Ottawa Canada |
#4
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Setting Lathe compound at precise angle, a Real Keeper!!!
"spaco" wrote in message ... I just summarized a recent post for myself, so I can add it to my own "machining hints" notebook. This one is one of those real keepers, as far as I am concerned. Thanks to the original poster and the guys who answered him. Pete Stanaitis. The Question: I'd like to try to turn some short tapers with a lathe. I'd be interested in suggestions on how to set a fairly precise angle. Answers: 1. If you have a sample of the taper needed: You start with a piece with that known taper mounted in the lathe and centered. Then you mount a dial test indicator in the toolpost and crank the compound rest back and forth watching the needle (indicating the taper, obviously). When the needle doesn't move, you have matched the taper. 2. If you don't have a sample of the taper needed: Fairly precise? With the engraved numbers on the cross slide. Preciser? With a cylindrical round in the chuck, a dial indicator on the compound and feeding a known distance with the compound. The rest is math. 3. If you don't have a sample of the taper needed: A guy I used to work with had a sine bar that had a base which was mounted between centers. The actual sine bar was hinged. I think he held the gage blocks and all together with rubber bands. I suppose he used a dead center under pressure to keep everything from moving. The harsh reality is that you have too many chances of introducing error by the method described in example 1. Not only must the indicator be dead on center, so , too, must the cutting tool. If an angle is critical, the reliable way to check it is with a sing bar or plate, and a proper setup. Harold |
#5
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Setting Lathe compound at precise angle, a Real Keeper!!!
Harold and Susan Vordos wrote:
"spaco" wrote in message ... I just summarized a recent post for myself, so I can add it to my own "machining hints" notebook. This one is one of those real keepers, as far as I am concerned. Thanks to the original poster and the guys who answered him. Pete Stanaitis. The Question: I'd like to try to turn some short tapers with a lathe. I'd be interested in suggestions on how to set a fairly precise angle. Answers: 1. If you have a sample of the taper needed: You start with a piece with that known taper mounted in the lathe and centered. Then you mount a dial test indicator in the toolpost and crank the compound rest back and forth watching the needle (indicating the taper, obviously). When the needle doesn't move, you have matched the taper. 2. If you don't have a sample of the taper needed: Fairly precise? With the engraved numbers on the cross slide. Preciser? With a cylindrical round in the chuck, a dial indicator on the compound and feeding a known distance with the compound. The rest is math. 3. If you don't have a sample of the taper needed: A guy I used to work with had a sine bar that had a base which was mounted between centers. The actual sine bar was hinged. I think he held the gage blocks and all together with rubber bands. I suppose he used a dead center under pressure to keep everything from moving. The harsh reality is that you have too many chances of introducing error by the method described in example 1. Not only must the indicator be dead on center, so , too, must the cutting tool. If an angle is critical, the reliable way to check it is with a sing bar or plate, and a proper setup. Harold What key would the sing bar been in, Harold? :-) Tom |
#6
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Setting Lathe compound at precise angle, a Real Keeper!!!
"Tom" wrote in message ... Harold and Susan Vordos wrote: snip----- If an angle is critical, the reliable way to check it is with a sing bar or plate, and a proper setup. Harold What key would the sing bar been in, Harold? :-) Tom Oh gawd! Did I type that? sigh! OK----lets change that to a sine bar. :-) Harold |
#7
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Setting Lathe compound at precise angle, a Real Keeper!!!
Naw, Harold! You typed it right the first time. "Sing", is the sound all those little gage blocks
and that bar thingie made when I threw them on the concrete floor. Bob Swinney "Harold and Susan Vordos" wrote in message . net... "Tom" wrote in message ... Harold and Susan Vordos wrote: snip----- If an angle is critical, the reliable way to check it is with a sing bar or plate, and a proper setup. Harold What key would the sing bar been in, Harold? :-) Tom Oh gawd! Did I type that? sigh! OK----lets change that to a sine bar. :-) Harold |
#8
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RCM: Setting Lathe compound at precise angle, a Real Keeper!!!
Hi Guys: I'm going through the current topics to hopefully suggest a way to tag valid RCM traffic. Add RCM: on the beginning of the title line - BEFORE the obligatory OT? Hang tiugh - keep posting. CaveLamb |
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