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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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Please help! tos trencin type sv18ra
Please help!
I need to know how to make 8 threads per inch on a tos trencin type sv18ra. Nobody in the shop can figure it out. I have looked all over for reference material that would help, with no luck. Any help would be greatly appreciated. Thank you Jon |
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Please help! tos trencin type sv18ra
Jon wrote: Please help! I need to know how to make 8 threads per inch on a tos trencin type sv18ra. Nobody in the shop can figure it out. I have looked all over for reference material that would help, with no luck. Any help would be greatly appreciated. Does it have a metric or imperial leadscrew? Most imperial leadscrews on larger lathes are 8 TPI, so all you need is a 1:1 ratio between the spindle and the leadscrew. That should be easy to accomplish. If the leadscrew is metric, only, then it gets more difficult. Some lathes have transposing gear sets that can be inserted in the gear train to make an approximate conversion between metric and imperial threads. But, because it is an approximation, and the basic leadscrew thread is the wrong pitch, you have to back up the lathe to wind the carriage back to the starting point. You cannot disengage the half nuts until you are done with the thread. Jon |
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Please help! tos trencin type sv18ra
What is a tos trencin type sv18ra?
8tpi is generally a pretty easy setting for a lathe to do if that is what it is. You do need a cutter with the right shape tho. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works evevery time it is tried! |
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Please help! tos trencin type sv18ra
On Wed, 16 Jul 2003 13:40:02 -0500, Jon Elson wrote:
If the leadscrew is metric, only, then it gets more difficult. Some lathes have transposing gear sets that can be inserted in the gear train to make an approximate conversion between metric and imperial threads. If the transpose gears are 127 tooth and 100 tooth, it isn't an approximation. It is *exact*. 127x2 is 254 which is the *exact* number of millimeters in an inch by definition. Gary |
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Please help! tos trencin type sv18ra
Gary Coffman wrote: On Wed, 16 Jul 2003 13:40:02 -0500, Jon Elson wrote: If the leadscrew is metric, only, then it gets more difficult. Some lathes have transposing gear sets that can be inserted in the gear train to make an approximate conversion between metric and imperial threads. If the transpose gears are 127 tooth and 100 tooth, it isn't an approximation. It is *exact*. 127x2 is 254 which is the *exact* number of millimeters in an inch by definition. Gary The thread will come out exact, assuming the QC box has the right selection, since the metric way is thread pitch, while us imperial types do threads/unit of measure. But, you STILL have to back up without disengaging the half-nuts, because the leadscrew pitch doesn't repeat every inch. Jon |
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Please help! tos trencin type sv18ra
"Bob May" wrote in message ...
What is a tos trencin type sv18ra? 8tpi is generally a pretty easy setting for a lathe to do if that is what it is. You do need a cutter with the right shape tho. Sorry, it is a lathe. Made in Slovakia, sometime in the '70s. I have access to the right cutter, I just wonder if it is possible to set this machine to cut 8 threads per inch without modifying it and if so how. Thank you Jon |
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