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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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Tapers
On Mon, 4 Feb 2019 16:59:16 -0600, Terry Coombs
wrote: * I finally figured out that the reason the drill chuck that came with my bench top milling machine was so wobbly is the mandrel . The JT taper is all weird , too loose in the bottom of the hole . And since I like a challenge (sometimes) I decided to fix it . BUT FIRST before I go screwing up a serviceable though ****ty part , I figured I needed to make sure I can recut that taper . So out of the corner comes the home made taper attachment - which I used exactly once before today . After an entire afternoon of adjusting and cutting and adjusting ... I finally got it dialed in and made a successful taper on some scrap stock . I did try making very light cuts on the mandrel , but ran out of length before I got it quite right . Now I have 2 ways I can go , I can build up the taper with the TIG welder , or I can machine a bit off the bottom of the R8 section of the mandrel to get a little more length . I'm concerned about warpage if I weld it , but can chuck it in the 4 jaw and dial it in to relocate the center hole in the taper if it doesn't run true . If I machine some off , I have about a quarter inch at the bottom of the R8 taper that's cylindrical before the taper starts . I'm not sure that's going to give me enough length to get the taper right and I'll end up welding anyway - but without that cylindrical section to dial it in on the lathe . Or maybe I'll just order a new one on ebay and save this one for another project ... last time I looked I couldn't find any , this time there are several choices . Frankly..unless you like farting around..order a new one. Saves you time and likely..money. __ "Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is. No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public. Which is a very good thing." Asun rauhassa, valmistaudun sotaan. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#2
Posted to rec.crafts.metalworking
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Tapers
On 2019-02-12, Gunner Asch wrote:
On Mon, 4 Feb 2019 16:59:16 -0600, Terry Coombs wrote: * I finally figured out that the reason the drill chuck that came with my bench top milling machine was so wobbly is the mandrel . The JT taper is all weird , too loose in the bottom of the hole [ ... ] Frankly..unless you like farting around..order a new one. Saves you time and likely..money. One thing to consider -- before your (now snipped) attempt to re-turn the taper -- you should have checked what the taper *really* was. Note that there are both the more common Jacobs tapers (JT?), and some for German tapers (B?? series), which are not necessarily interchangeable with Jacobs tapers. There may even be other tapers for chucks. Just to be sure -- get the chuck and the arbor at the same time, so you are sure that both are Jabobs tapers. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#3
Posted to rec.crafts.metalworking
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Tapers
On 13 Feb 2019 01:05:34 GMT, "DoN. Nichols"
wrote: On 2019-02-12, Gunner Asch wrote: On Mon, 4 Feb 2019 16:59:16 -0600, Terry Coombs wrote: * I finally figured out that the reason the drill chuck that came with my bench top milling machine was so wobbly is the mandrel . The JT taper is all weird , too loose in the bottom of the hole [ ... ] Frankly..unless you like farting around..order a new one. Saves you time and likely..money. One thing to consider -- before your (now snipped) attempt to re-turn the taper -- you should have checked what the taper *really* was. Note that there are both the more common Jacobs tapers (JT?), and some for German tapers (B?? series), which are not necessarily interchangeable with Jacobs tapers. There may even be other tapers for chucks. Just to be sure -- get the chuck and the arbor at the same time, so you are sure that both are Jabobs tapers. Enjoy, DoN. Well said! Here is a decent listing of all the various common taper systems and their measurements https://en.wikipedia.org/wiki/Machine_taper One can..can with some success..fill the hole with melted candle wax and pulling/pushing it out..measure the existing hole. It wont be perfect..but it will come close in most cases..to narrow down the taper family and size. https://en.wikipedia.org/wiki/Machine_taper Gunner __ "Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is. No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public. Which is a very good thing." Asun rauhassa, valmistaudun sotaan. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#4
Posted to rec.crafts.metalworking
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Tapers
On 2/12/2019 7:05 PM, DoN. Nichols wrote:
On 2019-02-12, Gunner Asch wrote: On Mon, 4 Feb 2019 16:59:16 -0600, Terry Coombs wrote: Â* I finally figured out that the reason the drill chuck that came with my bench top milling machine was so wobbly is the mandrel . The JT taper is all weird , too loose in the bottom of the hole [ ... ] Frankly..unless you like farting around..order a new one. Saves you time and likely..money. One thing to consider -- before your (now snipped) attempt to re-turn the taper -- you should have checked what the taper *really* was. Note that there are both the more common Jacobs tapers (JT?), and some for German tapers (B?? series), which are not necessarily interchangeable with Jacobs tapers. There may even be other tapers for chucks. Just to be sure -- get the chuck and the arbor at the same time, so you are sure that both are Jabobs tapers. Enjoy, DoN. The chuck/arbor in question came with my mill . And the original chuck and the replacement - I bought 2 from Iggy some years ago - are identical in dimensions . Both fit a known 33JT taper . The new mandrel came a few days ago , mounted the chuck and tried it out in the mill and it runs true to the eye . I haven't put a dial indicator on it yet , but it sure beats what I had . The original chuck is now on my small drill press , and it runs true too . The original mandrel is in the box for a future project , TBD at a later date . -- Snag Yes , I'm old and crochety - and armed . Get outta my woods ! |
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