Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
|
#1
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
I've got a suspicion that the Grizzly G9972Z spindle thread may not
be 1.75x8 I bought a Kalamazoo Chuck Micro Set chuck and a 1.75x8 mounting plate. The plate screws on about 4 threads, then stops. It does this from either direction. My suspicions are that I'm dealing with a metric thread. Anyone have a seller of M45x3 nuts so I can check the spindle nose? There are NO points for Grainger or McMaster. |
#2
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
Anyone have a seller of M45x3 nuts so I can check the spindle nose?
There are NO points for Grainger or McMaster. Louis The 1.75" X 8 tpi are off too much for M45X3 to be a consideration. Have you measured the Grizzly spindle thread to determine it actual dimensions? Bob AZ |
#3
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
In article , Bob AZ wrote:
Anyone have a seller of M45x3 nuts so I can check the spindle nose? There are NO points for Grainger or McMaster. Louis The 1.75" X 8 tpi are off too much for M45X3 to be a consideration. Not that far off: 1.75" = 44.45mm; 8 tpi = 3.175mm. |
#4
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
"Doug Miller" wrote in message ... In article , Bob AZ wrote: Anyone have a seller of M45x3 nuts so I can check the spindle nose? There are NO points for Grainger or McMaster. Louis The 1.75" X 8 tpi are off too much for M45X3 to be a consideration. Not that far off: 1.75" = 44.45mm; 8 tpi = 3.175mm. You probably could get the threads to engage, but the load wouldn't be distributed among the threads. You'd probably have less than a full thread in actual contact. That's the real weakness in having "almost" the right thread. -- Ed Huntress |
#5
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On Tue, 02 Mar 2010 19:12:04 -0600, Louis Ohland
wrote: I've got a suspicion that the Grizzly G9972Z spindle thread may not be 1.75x8 I bought a Kalamazoo Chuck Micro Set chuck and a 1.75x8 mounting plate. The plate screws on about 4 threads, then stops. It does this from either direction. My suspicions are that I'm dealing with a metric thread. Anyone have a seller of M45x3 nuts so I can check the spindle nose? There are NO points for Grainger or McMaster. You could measure it. Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever. Visually align the point of the bit with the crest (or the edge of a crest) of a spindle thread using a 10X loupe. Zero the DI that's tracking the carriage. Advance one thread, optically aligning the point of the bit with the next crest. Read the DI. You should now know the pitch to within a couple of thou. You can measure the OD with a mike and the pitch dia with three wires and a mike. |
#6
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On Mar 3, 1:00*am, Don Foreman wrote:
... You could measure it. * Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever.... Or mount the DI in the toolpost, set the lathe to thread and see if it tracks the spindle thread pitch. I would unplug the power cord first. When you have it set to follow the spindle thread, clean up the backplate thread. It may be correct but tight. I have an old South Bend chuck that won't quite screw all the way onto my lathe. jsw |
#7
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On Mar 3, 7:23*am, Jim Wilkins wrote:
... When you have it set to follow the spindle thread, ... One of my first projects was a stub copy of the lathe's spindle to take on treasure hunts. Mine is 2" Sched 40 water pipe. The thread roots break into the ID in a few places but it's good enough to check fits by hand. For yours a Sched 80 1-1/2" pipe nipple is 1.9" OD and 1.5" ID. Perhaps you could turn a piece of wood to jam into the MT4 spindle bore taper, then pound the pipe nipple onto it and lock the assembly together with threaded rod through the spindle. Support it with the tailstock center so it doesn't depend on a perfect taper fit. Then you would have the spindle thread available to compare the maximum and three-wire diameters while you threaded the pipe. Also copy the unthreaded (register) diameter and the lengths. If you don't mind spending a little more instead of carving wood you could buy this and a 3-4 sleeve: http://grizzly.com/products/MT3-Stub...Arbor-1-/G9308 The 1" shank is 2.0" long, the thread is 1"-14 left-handed. The drive key on mine removes easily by clamping it in the milling vise. jsw |
#8
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On 3/3/2010 00:00, Don Foreman wrote:
Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever. Visually align the point of the bit with the crest (or the edge of a crest) of a spindle thread using a 10X loupe. Zero the DI that's tracking the carriage. Advance one thread, optically aligning the point of the bit with the next crest. Read the DI. You should now know the pitch to within a couple of thou. You can measure the OD with a mike and the pitch dia with three wires and a mike. Don, you were helpful. Better quit that before you get into trouble... Didn't think of measuring the crest to crest distance that way. I do have a Mighty Mag not doing anything... Never used my Pee Dee thread wires since shop operations 1 back in 96... Tried thread triangles last night, and it didn't come up with a reasonable result. OD has been determined with a digital caliper, multiple times. To do list: Measure crest to crest distance Dust off thread wires and determine pitch diameter Last step is drink heavily... Grizzly answered back, they are researching it... |
#9
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
4 threads in .504 thousandths. I'd say 8 tpi is pretty damn close.
Major diameter is 1.749 (D) Pee Dee thread wire for use with 8tpi is .072", Constant for .072" wires is .10775 (C) Diameter over wires is 1.768" (M) Formula to determine pitch diameter is E= M - Constant E= 1.768 - .10775 E= 1.66025 Looking in Machinery's Handbook, pg 1668, Table 4: 1 3/4-8 UN Class 2A Maj Dia Pitch dia 1.7477 Max 1.7327 Min 1.6665 Max 1.6590 Min 1 3/4-8 UN Class 3A Maj Dia Pitch dia 1.7500 Max 1.7350 Min 1.6688 Max 1.6632 Min If PD is 1.66025, it fits in Class 2A, but the Major diameter is 1.749 which is roughly 1.5 thou over. BUT... the adapter threads on about four threads before it stops. I'm thinking the Major Diameter is not all that critical. On 3/3/2010 08:46, Louis Ohland wrote: On 3/3/2010 00:00, Don Foreman wrote: Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever. Visually align the point of the bit with the crest (or the edge of a crest) of a spindle thread using a 10X loupe. Zero the DI that's tracking the carriage. Advance one thread, optically aligning the point of the bit with the next crest. Read the DI. You should now know the pitch to within a couple of thou. You can measure the OD with a mike and the pitch dia with three wires and a mike. Don, you were helpful. Better quit that before you get into trouble... Didn't think of measuring the crest to crest distance that way. I do have a Mighty Mag not doing anything... Never used my Pee Dee thread wires since shop operations 1 back in 96... Tried thread triangles last night, and it didn't come up with a reasonable result. OD has been determined with a digital caliper, multiple times. To do list: Measure crest to crest distance Dust off thread wires and determine pitch diameter Last step is drink heavily... Grizzly answered back, they are researching it... |
#10
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
If the thread crests are sharp, the OD will make a difference. Have you
tried some bluing to find where it is rubbbing? Louis Ohland wrote: 4 threads in .504 thousandths. I'd say 8 tpi is pretty damn close. Major diameter is 1.749 (D) Pee Dee thread wire for use with 8tpi is .072", Constant for .072" wires is .10775 (C) Diameter over wires is 1.768" (M) Formula to determine pitch diameter is E= M - Constant E= 1.768 - .10775 E= 1.66025 Looking in Machinery's Handbook, pg 1668, Table 4: 1 3/4-8 UN Class 2A Maj Dia Pitch dia 1.7477 Max 1.7327 Min 1.6665 Max 1.6590 Min 1 3/4-8 UN Class 3A Maj Dia Pitch dia 1.7500 Max 1.7350 Min 1.6688 Max 1.6632 Min If PD is 1.66025, it fits in Class 2A, but the Major diameter is 1.749 which is roughly 1.5 thou over. BUT... the adapter threads on about four threads before it stops. I'm thinking the Major Diameter is not all that critical. On 3/3/2010 08:46, Louis Ohland wrote: On 3/3/2010 00:00, Don Foreman wrote: Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever. Visually align the point of the bit with the crest (or the edge of a crest) of a spindle thread using a 10X loupe. Zero the DI that's tracking the carriage. Advance one thread, optically aligning the point of the bit with the next crest. Read the DI. You should now know the pitch to within a couple of thou. You can measure the OD with a mike and the pitch dia with three wires and a mike. Don, you were helpful. Better quit that before you get into trouble... Didn't think of measuring the crest to crest distance that way. I do have a Mighty Mag not doing anything... Never used my Pee Dee thread wires since shop operations 1 back in 96... Tried thread triangles last night, and it didn't come up with a reasonable result. OD has been determined with a digital caliper, multiple times. To do list: Measure crest to crest distance Dust off thread wires and determine pitch diameter Last step is drink heavily... Grizzly answered back, they are researching it... |
#11
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On 3/3/2010 10:46, RoyJ wrote:
If the thread crests are sharp, the OD will make a difference. Have you tried some bluing to find where it is rubbbing? I have Dykem blue and the time to do it. Any hints on what wear in certain areas if the thread means? Louis Ohland wrote: 4 threads in .504 thousandths. I'd say 8 tpi is pretty damn close. Major diameter is 1.749 (D) Pee Dee thread wire for use with 8tpi is .072", Constant for .072" wires is .10775 (C) Diameter over wires is 1.768" (M) Formula to determine pitch diameter is E= M - Constant E= 1.768 - .10775 E= 1.66025 Looking in Machinery's Handbook, pg 1668, Table 4: 1 3/4-8 UN Class 2A Maj Dia Pitch dia 1.7477 Max 1.7327 Min 1.6665 Max 1.6590 Min 1 3/4-8 UN Class 3A Maj Dia Pitch dia 1.7500 Max 1.7350 Min 1.6688 Max 1.6632 Min If PD is 1.66025, it fits in Class 2A, but the Major diameter is 1.749 which is roughly 1.5 thou over. BUT... the adapter threads on about four threads before it stops. I'm thinking the Major Diameter is not all that critical. On 3/3/2010 08:46, Louis Ohland wrote: On 3/3/2010 00:00, Don Foreman wrote: Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever. Visually align the point of the bit with the crest (or the edge of a crest) of a spindle thread using a 10X loupe. Zero the DI that's tracking the carriage. Advance one thread, optically aligning the point of the bit with the next crest. Read the DI. You should now know the pitch to within a couple of thou. You can measure the OD with a mike and the pitch dia with three wires and a mike. Don, you were helpful. Better quit that before you get into trouble... Didn't think of measuring the crest to crest distance that way. I do have a Mighty Mag not doing anything... Never used my Pee Dee thread wires since shop operations 1 back in 96... Tried thread triangles last night, and it didn't come up with a reasonable result. OD has been determined with a digital caliper, multiple times. To do list: Measure crest to crest distance Dust off thread wires and determine pitch diameter Last step is drink heavily... Grizzly answered back, they are researching it... |
#12
Posted to rec.crafts.metalworking
|
|||
|
|||
Determining interior thread dimensions was When is an M45x3 nota 1.75x8 thread?
OK, finding the PD for an exterior thread was too easy. In the best
spirit of McGyver, how can one measure the interior PD? I'd like to verify the thread dimensions of this chuck adapter plate. On 3/3/2010 10:15, Louis Ohland wrote: 4 threads in .504 thousandths. I'd say 8 tpi is pretty damn close. Major diameter is 1.749 (D) Pee Dee thread wire for use with 8tpi is .072", Constant for .072" wires is .10775 (C) Diameter over wires is 1.768" (M) Formula to determine pitch diameter is E= M - Constant E= 1.768 - .10775 E= 1.66025 Looking in Machinery's Handbook, pg 1668, Table 4: 1 3/4-8 UN Class 2A Maj Dia Pitch dia 1.7477 Max 1.7327 Min 1.6665 Max 1.6590 Min 1 3/4-8 UN Class 3A Maj Dia Pitch dia 1.7500 Max 1.7350 Min 1.6688 Max 1.6632 Min If PD is 1.66025, it fits in Class 2A, but the Major diameter is 1.749 which is roughly 1.5 thou over. BUT... the adapter threads on about four threads before it stops. I'm thinking the Major Diameter is not all that critical. On 3/3/2010 08:46, Louis Ohland wrote: On 3/3/2010 00:00, Don Foreman wrote: Put a sharp V threading bit in the toolholder and stick a DI on the bed with a magnet or whatever. Visually align the point of the bit with the crest (or the edge of a crest) of a spindle thread using a 10X loupe. Zero the DI that's tracking the carriage. Advance one thread, optically aligning the point of the bit with the next crest. Read the DI. You should now know the pitch to within a couple of thou. You can measure the OD with a mike and the pitch dia with three wires and a mike. Don, you were helpful. Better quit that before you get into trouble... Didn't think of measuring the crest to crest distance that way. I do have a Mighty Mag not doing anything... Never used my Pee Dee thread wires since shop operations 1 back in 96... Tried thread triangles last night, and it didn't come up with a reasonable result. OD has been determined with a digital caliper, multiple times. To do list: Measure crest to crest distance Dust off thread wires and determine pitch diameter Last step is drink heavily... Grizzly answered back, they are researching it... |
#13
Posted to rec.crafts.metalworking
|
|||
|
|||
Determining interior thread dimensions was When is an M45x3 not a 1.75x8 thread?
Louis Ohland wrote:
OK, finding the PD for an exterior thread was too easy. In the best spirit of McGyver, how can one measure the interior PD? Cerrosafe? http://www.brownells.com/.aspx/pid=3..._CASTING_ALLOY Wes |
#14
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
Louis Ohland wrote:
If PD is 1.66025, it fits in Class 2A, but the Major diameter is 1.749 which is roughly 1.5 thou over. BUT... the adapter threads on about four threads before it stops. I'm thinking the Major Diameter is not all that critical. The major diameter is not SUPPOSED to be critical, but if the point on the threading tool used to make the backplate was breaking down, the major diameter in the plate would come up UNDERSIZE, ending in a tight fit. I think it is time to use blue dye on the spindle and wring the plate on, then inspect where the dye transfers in the plate, and where it gets rubbed off from the spindle. I think a likely scenario is either the plate is entirely undersize (not easy to measure without a go-nogo gauge) or the major dia. is short, which is the most likely situation. If you can get this thing mounted on your lathe somehow, chase the thread lightly with a sharply-pointed threading tool and then re-check the fit. Jon |
#15
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
Louis Ohland wrote:
I've got a suspicion that the Grizzly G9972Z spindle thread may not be 1.75x8 I bought a Kalamazoo Chuck Micro Set chuck and a 1.75x8 mounting plate. The plate screws on about 4 threads, then stops. It does this from either direction. My suspicions are that I'm dealing with a metric thread. Anyone have a seller of M45x3 nuts so I can check the spindle nose? There are NO points for Grainger or McMaster. If you have a tap and die set, they have a thread gauge, which should maybe have an 8 TPI leaf on it. If not, use the 16 TPI leaf, and see if the thread is 8 TPI (perfectly exact fit in the gauge) or 3 mm which won't fit the gauge well. It may just be an overly tight thread, too. Jon |
#16
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On 3/3/2010 17:13, Jon Elson wrote:
Louis Ohland wrote: I've got a suspicion that the Grizzly G9972Z spindle thread may not be 1.75x8 If you have a tap and die set, they have a thread gauge, which should maybe have an 8 TPI leaf on it. If not, use the 16 TPI leaf, and see if the thread is 8 TPI (perfectly exact fit in the gauge) or 3 mm which won't fit the gauge well. It may just be an overly tight thread, too. It was a spot on fit to an 8 tpi leaf, both the spindle and the adapter plate... |
#17
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On Mar 3, 6:25*pm, Louis Ohland wrote:
... What do you have now for chucks or faceplates that do fit the spindle? jsw |
#18
Posted to rec.crafts.metalworking
|
|||
|
|||
When is an M45x3 not a 1.75x8 thread?
On 3/3/2010 17:25, Louis Ohland wrote:
On 3/3/2010 17:13, Jon Elson wrote: Louis Ohland wrote: I've got a suspicion that the Grizzly G9972Z spindle thread may not be 1.75x8 Response from Grizzly After reviewing your callback, our records indicate that the correct spindle thread for the G9972Z lathe is 1 3/4 x 8. Our back plates are made with a shallow cut thread and may require machining to fit threads. If we may be of any further assistance, please do not hesitate to contact us. You are a valued customer, and we look forward to serving your future woodworking and metalworking needs. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Re C.C.T.V Thread. | UK diy | |||
Another 4-start thread question - 1/4" internal thread | Metalworking | |||
Questions regarding thread diameter and pitch for special design case with limited thread length | Metalworking | |||
Yet another MDF thread | Woodworking | |||
10-32 thread and 3/16-32 thread. What's the difference? | Metalworking |