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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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BRIDGEPORT MILL, TYPES OF SPINDLES
Hello guys, I recently acquired a used Bridgeport mill ( my first encounter) a
friend had outdoors . I managed to get all the parts freed up, even the motor works. But i've encountered one road-block, the R8 collet i tried in the spindle seems to be too long. _*_What other type of collet does the Bridgeport use?_*_ I think this is a J series, here is the serial # J163607 stamped on the head. A plate attached to the head has drive serial #2J40289. ** -- posted from http://www.polytechforum.com/metalwo...es-625530-.htm using PolyTechForum's Web, RSS and Social Media Interface to rec.crafts.metalworking and other engineering groups |
#2
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BRIDGEPORT MILL, TYPES OF SPINDLES
"mango" wrote in message oups.com... Hello guys, I recently acquired a used Bridgeport mill ( my first encounter) a friend had outdoors . I managed to get all the parts freed up, even the motor works. But i've encountered one road-block, the R8 collet i tried in the spindle seems to be too long. _*_What other type of collet does the Bridgeport use?_*_ I think this is a J series, here is the serial # J163607 stamped on the head. A plate attached to the head has drive serial #2J40289. ** -- posted from http://www.polytechforum.com/metalwo...es-625530-.htm using PolyTechForum's Web, RSS and Social Media Interface to rec.crafts.metalworking and other engineering groups Could be a 2MT, i remember some of the old bridgeports had that taper. Best Regards Tom. |
#3
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BRIDGEPORT MILL, TYPES OF SPINDLES
Have you rotated the R8 ? there is likely a pin that goes into a slot
on the R8. Where did you get the R8 with the mill ? more of them ?? options ?? Is there an insert already there ? Martin On 2/8/2016 5:18 PM, mango wrote: Hello guys, I recently acquired a used Bridgeport mill ( my first encounter) a friend had outdoors . I managed to get all the parts freed up, even the motor works. But i've encountered one road-block, the R8 collet i tried in the spindle seems to be too long. _*_What other type of collet does the Bridgeport use?_*_ I think this is a J series, here is the serial # J163607 stamped on the head. A plate attached to the head has drive serial #2J40289. ** |
#4
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BRIDGEPORT MILL, TYPES OF SPINDLES
mango wrote:
Hello guys, I recently acquired a used Bridgeport mill ( my first encounter) a friend had outdoors . I managed to get all the parts freed up, even the motor works. But i've encountered one road-block, the R8 collet i tried in the spindle seems to be too long. _*_What other type of collet does the Bridgeport use?_*_ I think this is a J series, here is the serial # J163607 stamped on the head. A plate attached to the head has drive serial #2J40289. ** A 2J head spindle is either an R8 or Erickson QC30 There were also some with KwickSwitch 300 (which if that is what you have, plan on replacing the spindle because those are RARE... -- Steve W. |
#5
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BRIDGEPORT MILL, TYPES OF SPINDLES
On 2016-02-08, mango wrote:
Hello guys, I recently acquired a used Bridgeport mill ( my first encounter) a friend had outdoors . I managed to get all the parts freed up, even the motor works. But i've encountered one road-block, the R8 collet i tried in the spindle seems to be too long. You know that there is a keying pin in the spindle to engage a groove in the R8 collet? You have to rotate the collet until the pin engages the groove so you can push the collet up into the spindle. The purpose of the pin is *not* for drive torque, but rather to allow you to turn the drawbar at the top of the head without having to hold the collet after the first turn or two to engage the drawbar threads. Some people don't like this, and have removed the keying pin, but if I were using R8 collets, *I* would want to keep the keying pin installed. I have helped a friend replace a sheared off one. _*_What other type of collet does the Bridgeport use?_*_ I think this is a J series, here is the serial # J163607 stamped on the head. A plate attached to the head has drive serial #2J40289. ** Is it *possible* that you have a machine which started life as a CNC machine? Bridgeport had a number of machines with a spindle for the NTMB 30 mill holders. That one has a knurled collar on the bottom of the spindle with some holes for a pin spanner wrench. It turns something like a half turn or so and rotates a pair of fingers which passed through slots in the flange of the NTMB 30 so they are now over the flange, and then clamps the fingers down to hold the flange in place, and the mill holder (which *may* use certain collets) firmly in place. This short rotation allows quick switching of tools -- *and* retains the projection of the tool between insertions, unlike an R8 collet, which has a different projection every time you swap the end mill. The normal R8 spindle has no such collar, so you may simply be encountering the keying pin. 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 --- |
#6
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BRIDGEPORT MILL, TYPES OF SPINDLES
On 2016-02-09, Howard Beal wrote:
"mango" wrote in message oups.com... Hello guys, I recently acquired a used Bridgeport mill ( my first encounter) a friend had outdoors . I managed to get all the parts freed up, even the motor works. But i've encountered one road-block, the R8 collet i tried in the spindle seems to be too long. _*_What other type of collet does the Bridgeport use?_*_ I think this is a J series, here is the serial # J163607 stamped on the head. A plate attached to the head has drive serial #2J40289. ** [ ... ] Could be a 2MT, i remember some of the old bridgeports had that taper. Could be --- but unlikely in a J-head mill. The keying pin, or the alternative NTMB-30 quick-switch spindle are the most likely, here. I described both in an article just posted before this one. 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 --- |
#7
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BRIDGEPORT MILL, TYPES OF SPINDLES
On Mon, 8 Feb 2016 17:23:04 -0800, "Howard Beal"
wrote: J163607 Thats a 1974 machine..so its probably NOT anything other than an R8 Take a good look up into the spindle and see if the alignment screw hasnt been moved too far out into the bore and is blocking the hole. Ive seen this happen several times, generally with machines that were fussed with by second owners.....unless..unless you have one with the Ericson QC-30 spindle noses. I have (2) spindles with that on them. http://www.practicalmachinist.com/vb...pindle-177124/ Gunner, who rebuilds BPs on the side. |
#8
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BRIDGEPORT MILL, TYPES OF SPINDLES
replying to Martin Eastburn, mango wrote:
The collet aligning screw is broken off, i plan to replace it. When i slammed the R8 collet in the spindle it didn't go all the way in. I measured the distance from the shoulder inside the spindle to the end of the spindle, compared to the R8, it was shorter by 1-1/8". I had the R8 prior to the mill. There is no insert in the spindle. -- posted from http://www.polytechforum.com/metalwo...es-625530-.htm using PolyTechForum's Web, RSS and Social Media Interface to rec.crafts.metalworking and other engineering groups |
#9
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BRIDGEPORT MILL, TYPES OF SPINDLES
replying to Steve W., mango wrote:
So far i've heard about the 2MT, the NTMB30 and the EricksonQC30 spindles/collets. I copied the taper in the spindle on a piece of wood, it MATCHES the taper on the R8. Only difference is the length of the straight portion of the R8, which is 3", compared to the 2'' straight portion inside the spindle. Which one of those spindles mentioned measures 2" from the end opp. the taper to the start of taper? -- posted from http://www.polytechforum.com/metalwo...es-625530-.htm using PolyTechForum's Web, RSS and Social Media Interface to rec.crafts.metalworking and other engineering groups |
#10
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BRIDGEPORT MILL, TYPES OF SPINDLES
replying to DoN. Nichols, mango wrote:
Now that you described the NTMB30 i know it's not one of those. I've used a JET mill, and the spindle looks similar, that's why i tried the R8 collet, which fits the Jet. That leaves the 2MT and ERICKSON QC 30. Which one of those two measures 2" from the end to where the taper starts, has the same taper as the R8, and has total length of approx. 3"? -- posted from http://www.polytechforum.com/metalwo...es-625530-.htm using PolyTechForum's Web, RSS and Social Media Interface to rec.crafts.metalworking and other engineering groups |
#11
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BRIDGEPORT MILL, TYPES OF SPINDLES
On Fri, 12 Feb 2016 12:33:22 -0800, Gunner Asch
wrote: On Mon, 8 Feb 2016 17:23:04 -0800, "Howard Beal" wrote: J163607 Thats a 1974 machine..so its probably NOT anything other than an R8 Take a good look up into the spindle and see if the alignment screw hasnt been moved too far out into the bore and is blocking the hole. Ive seen this happen several times, generally with machines that were fussed with by second owners.....unless..unless you have one with the Ericson QC-30 spindle noses. I have (2) spindles with that on them. http://www.practicalmachinist.com/vb...pindle-177124/ Gunner, who rebuilds BPs on the side. Here are ALL the tapers/holders that BP ever produced. http://www.lathes.co.uk/bridgeport/page3.html Get a good photo , taken UP the spindle, with the draw bar removed and lets see what we can determine the critter is. Gunner |
#12
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BRIDGEPORT MILL, TYPES OF SPINDLES
On 2016-02-12, mango wrote:
replying to Steve W., mango wrote: So far i've heard about the 2MT, the NTMB30 and the EricksonQC30 The latter two are the same thing. Just Erickson is one maker of those -- and makes the Quick-Change spindle chuck for them. spindles/collets. I copied the taper in the spindle on a piece of wood, it MATCHES the taper on the R8. Only difference is the length of the straight portion of the R8, which is 3", compared to the 2'' straight portion inside the spindle. Which one of those spindles mentioned measures 2" from the end opp. the taper to the start of taper? The 30 taper (NTMB or Erickson) is actually the same taper as the tapered part of an R8 collet. It goes down to a smaller diameter, and longer in general in the tapered part. But that part is not critical, as a drawbar engages the threads in the tool holder, and pulls the larger diameter part of the taper of the holder firmly against the female taper of the spindle. (Or the QC chuck pulls the male taper of the holder firmly against the female taper of the spindle.) Exactly what the clearance back there will actually be remains to be seen. Do you have a copy of _Machinery's Handbook_? It will include drawings for the NTMB 30 (and other tapers of different sizes but the same basic design.) Beware that I often transpose letters in the NTMB (maybe NMTB instead), so look under both. You will only find one of the two. :-) Other things like the CAT-30 taper tool holders will be the same taper, but instead of accepting a drawbar, will have a projecting ball which is gripped by a set of expanding fingers -- and *that* might need the larger diameter. Usually, that sort of thing will be found with an automatic tool changer on the mill. Oh yes -- the CAT-30 will have a thicker flange, with a V-groove in the edge for the automatic changer to handle it. Good Luck, 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 --- |
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