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Re: Lead screw chip shield
I learned something unexpected about my chip shield recently. It still works great but.... To set the stage, my lathe came with many chucks. The installed one was a 6" Bison 3 jaw scroll.? There was also a 3 jaw that probably came with the lathe from Atlas.? It's much smaller in all dimensions.? I used it recently because the Bison jaws were too big for the internal clamping job at hand.? With the small Atlas chuck, the carriage was now able to move much closer to the headstock.? The PVC pipe cover had to be removed and i'd have to say there is not enough exposed screw remaining for a reasonable cover length of that design style.? Sorry for unintentionally misleading y'all.
Here is a link to original post with images. /g/atlas-craftsman/message/107846 |
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Re: Carriage Stop and Indicator
Here is a link to a previous post with images of my carriage stop and indicator.
/g/atlas-craftsman/message/107850 |
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Re: OT-how to test and repair DC brushed motors.
 wannabeGP
On Saturday, August 12, 2023 at 01:30:12 PM EDT, Bill in OKC too via groups.io <wmrmeyers@...> wrote:
Not where I grew up. We had another phrase for that, and I'm too inhibited to use it anymore. I guess we could call it red-neck engineering. Sort of thing farmers do to get critical equipment to operate when they need it and the only folks that can be hired to fix things have a long wait time and harvest is due RFN.? Not really a redneck, just a wannabe. Though my other grandma was from Beckley, WV. So I have some redneck ancestry! ;) Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Friday, August 11, 2023 at 09:53:35 PM CDT, mike allen <animal@...> wrote:
??? ??? no " micky mousing " is when you do something halfassed that? you know in the back of your mind can possibly injure someone . ??? ??? animal On 8/11/23 5:31 PM, Bill in OKC too via
groups.io wrote:
Yep. That's what we call
"micky-mousing" something. I grew up not too far from
Disneyland! Dad and Grandpa were great at it!
William
R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by:
Good judgement comes from experience.
Experience comes from bad judgement.?
SEMPER GUMBY!
Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect
in one hand, expectorate in the other. See
which one gets full first.
On Friday, August 11, 2023 at 06:49:02 PM CDT, mike
allen <animal@...> wrote:
??? ??? push comes to shove , ya can gut the motor take the armature off the shaft & put the shaft back in & power the shaft from another motor . ??? You'd be surprised at some of the things we've done to keep things workin . Years ago my bud scores a 4 cylinder compressor from his wife's boss , he was a dentist . The motor had burnt up in this compressor so they bought a new one & passed the burnt on over to my bud . Did the same thing here ,? tore the motor apart emptied the armature shaft & then installed a pulley in the shaft & cut a notch in the motor housing . Then I found a nice piece of scrap plate in my
someday pile & mounted a motor on it & bolted
the plate under the old motor , ran a belt from new
motor to new pulley on the shaft from the old motor
& the rest is history . ??? ??? Yer half way there already with the bad motor . ??? anmal On
8/11/23 3:55 PM, Bill in OKC too via groups.io wrote:
Unless I want to completely redesign
it, I need the right-angle gear box. I'm not
qualified for that! I could probably put a
different gear box on it, but none of the ones
I've found are near the right size. Too big, or
too small, nothing in the Goldilocks zone. I do
have a Leeson DC motor and probably some spare
brushes for larger motors from my former work,
that they trashed. All I have to do is find them.
IF I can find something, I can probably cut it
down if it's not the right size already. I am good
at micky-mousing something...?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by:
Good judgement comes from
experience. Experience comes from bad
judgement.?
SEMPER GUMBY!
Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in
one hand, expectorate in the other.
See which one gets full first.
On Friday, August 11, 2023 at 01:39:17 PM CDT,
mike allen <animal@...>
wrote:
??? ??? Just tossin this out there , with
no load on the motor you will not get the
actual amp reading . Also unless? you have a
good DC clamp meter most DVM that do amps
top out at 10 amps . ?? ??? I thought there was a guy in this group that had a motor shop ?? Does the motor absolutely have to have the right angle gear box or can it be a straight gear reduction motor ? ??? ??? animal On
8/11/23 9:02 AM, Bill in OKC too via
groups.io wrote:
SWMBO' s power wheelchair lift crapped out
the other day. New motor is no longer
available since the lift is ancient.
Manufacturer of the lift removed any OEM
markings. It's a right- angle gear motor,
which I'll eventually have some photos and
dimensions for. This is the in-and-out motor
for a Harmar AL-600 lift that fits in the back
of a van. Near as I can remember it was made
about 2007 or so.?
There is no continuity in the motor, but? othinf seems burned. I pulled it apart and fiddled with it, and got continuity back. Hooked it back up to power trying to get a current draw reading and it spun up and? rapped out again. No continuity again. Brushes look good.? I have a megger for testing? insulation, and an assortment of DVMs and at least one analog voltmeter. Somewhere in the library are a couple of older books on motor testing and repair, but haven't found them yet. Any suggestions for resources? I looked at Grainger & McMaster-Carr, also Amazon & Surplus Center. They have similar gear motors but nothing that looks exactly? right. Most are either way too light or way too heavy. This is a 12vdc motor, could draw as much as 20amps, but probably closer to 10, and could less. There is another motor on it with a different gearbox. Looks to be about the same motor. May fiddle with that, and get a current draw. Found one of these motors for sale on the knoppix site for $600, was $400 from Harmar at one time. Seems a bit fishy to me, and can't afford it anyway.? Gotta get ready to take SWMBO to get fitted for a new CPAP mask, and for both of us to get new CPAP machines. Hope someone can point me in a useful direction. Used to be a bunch of folks whe rebuilt motors & alternators/generators around here. Called one and they don't do DC motors at all, and don't think there's anyone left who does., Any help will be appreciated! Bill in OKC? |
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Re: OT-how to test and repair DC brushed motors.
I think I've got it mostly sorted, at the moment, but I've bookmarked your site just in case! Though I admit to being a cheap bastrich, and wanting to save the money by doing it myself. ;) If it turns out that I'm wrong, I'll give you a call! Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Saturday, August 12, 2023 at 09:01:30 AM CDT, rockindubya via groups.io <jeffwoods95@...> wrote:
Late to the thread.DC motor guy here - 50 years. I can repair and or rewind. Still quite involved in my "golden years" Please post 2 pics of the armature, one each side. Odds are I can evaluate by viewing. Be happy to assist you. Here's my Hemmings ad. |
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Re: OT-how to test and repair DC brushed motors.
Not where I grew up. We had another phrase for that, and I'm too inhibited to use it anymore. I guess we could call it red-neck engineering. Sort of thing farmers do to get critical equipment to operate when they need it and the only folks that can be hired to fix things have a long wait time and harvest is due RFN.? Not really a redneck, just a wannabe. Though my other grandma was from Beckley, WV. So I have some redneck ancestry! ;) Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Friday, August 11, 2023 at 09:53:35 PM CDT, mike allen <animal@...> wrote:
??? ??? no " micky mousing " is when you do something halfassed that? you know in the back of your mind can possibly injure someone . ??? ??? animal On 8/11/23 5:31 PM, Bill in OKC too via
groups.io wrote:
Yep. That's what we call
"micky-mousing" something. I grew up not too far from
Disneyland! Dad and Grandpa were great at it!
William
R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by:
Good judgement comes from experience.
Experience comes from bad judgement.?
SEMPER GUMBY!
Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect
in one hand, expectorate in the other. See
which one gets full first.
On Friday, August 11, 2023 at 06:49:02 PM CDT, mike
allen <animal@...> wrote:
??? ??? push comes to shove , ya can gut the motor take the armature off the shaft & put the shaft back in & power the shaft from another motor . ??? You'd be surprised at some of the things we've done to keep things workin . Years ago my bud scores a 4 cylinder compressor from his wife's boss , he was a dentist . The motor had burnt up in this compressor so they bought a new one & passed the burnt on over to my bud . Did the same thing here ,? tore the motor apart emptied the armature shaft & then installed a pulley in the shaft & cut a notch in the motor housing . Then I found a nice piece of scrap plate in my
someday pile & mounted a motor on it & bolted
the plate under the old motor , ran a belt from new
motor to new pulley on the shaft from the old motor
& the rest is history . ??? ??? Yer half way there already with the bad motor . ??? anmal On
8/11/23 3:55 PM, Bill in OKC too via groups.io wrote:
Unless I want to completely redesign
it, I need the right-angle gear box. I'm not
qualified for that! I could probably put a
different gear box on it, but none of the ones
I've found are near the right size. Too big, or
too small, nothing in the Goldilocks zone. I do
have a Leeson DC motor and probably some spare
brushes for larger motors from my former work,
that they trashed. All I have to do is find them.
IF I can find something, I can probably cut it
down if it's not the right size already. I am good
at micky-mousing something...?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by:
Good judgement comes from
experience. Experience comes from bad
judgement.?
SEMPER GUMBY!
Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in
one hand, expectorate in the other.
See which one gets full first.
On Friday, August 11, 2023 at 01:39:17 PM CDT,
mike allen <animal@...>
wrote:
??? ??? Just tossin this out there , with
no load on the motor you will not get the
actual amp reading . Also unless? you have a
good DC clamp meter most DVM that do amps
top out at 10 amps . ?? ??? I thought there was a guy in this group that had a motor shop ?? Does the motor absolutely have to have the right angle gear box or can it be a straight gear reduction motor ? ??? ??? animal On
8/11/23 9:02 AM, Bill in OKC too via
groups.io wrote:
SWMBO' s power wheelchair lift crapped out
the other day. New motor is no longer
available since the lift is ancient.
Manufacturer of the lift removed any OEM
markings. It's a right- angle gear motor,
which I'll eventually have some photos and
dimensions for. This is the in-and-out motor
for a Harmar AL-600 lift that fits in the back
of a van. Near as I can remember it was made
about 2007 or so.?
There is no continuity in the motor, but? othinf seems burned. I pulled it apart and fiddled with it, and got continuity back. Hooked it back up to power trying to get a current draw reading and it spun up and? rapped out again. No continuity again. Brushes look good.? I have a megger for testing? insulation, and an assortment of DVMs and at least one analog voltmeter. Somewhere in the library are a couple of older books on motor testing and repair, but haven't found them yet. Any suggestions for resources? I looked at Grainger & McMaster-Carr, also Amazon & Surplus Center. They have similar gear motors but nothing that looks exactly? right. Most are either way too light or way too heavy. This is a 12vdc motor, could draw as much as 20amps, but probably closer to 10, and could less. There is another motor on it with a different gearbox. Looks to be about the same motor. May fiddle with that, and get a current draw. Found one of these motors for sale on the knoppix site for $600, was $400 from Harmar at one time. Seems a bit fishy to me, and can't afford it anyway.? Gotta get ready to take SWMBO to get fitted for a new CPAP mask, and for both of us to get new CPAP machines. Hope someone can point me in a useful direction. Used to be a bunch of folks whe rebuilt motors & alternators/generators around here. Called one and they don't do DC motors at all, and don't think there's anyone left who does., Any help will be appreciated! Bill in OKC? |
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Re: OT-how to test and repair DC brushed motors.
Yep. PM brushed motor. Ohm meter is still useful for continuity checks through the brushes, brush holders, wire from them to the connectors, etc. Dad taught me how to use an ohm meter back when most of them were vacuum tube operated and all analog displays. Pretty sure I still have a VTVM here someplace... Been a while since I've seen it, though. ;) Been a hobby electronics type most of my life, and 12 years as a Satellite Communications tech for the USAF. Had some spiffy test equipment there, and that was long enough ago that most of it is probably available on the surplus market for prices I could almost afford now. But I already have too many expensive hobbies. ;) William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Friday, August 11, 2023 at 09:43:01 PM CDT, Jon Elson <elson@...> wrote:
On 8/11/23 20:33, Steven Nederhiser wrote: Hello Bill;I'm pretty sure that is a permanent magnet motor, so no field winding. Jon |
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Re: OT-how to test and repair DC brushed motors.
If I talk to anyone in or from Santa Fe Springs I might get homesick! ;) Grew up mostly there, Norwalk, La Mirada, and Whittier. I have been using heck out of my newest DVM from Harbor Freight. Got a nice continuity check function, and if you select any of the Ohms settings except that or diode check, it will auto-range. Getting 20.3ohms even without one of the brush caps in place. Hit the interiors of the brush holders with CRC QD Electronic Cleaner and a Q-tip, just in case it had surface corrosion. Have to properly caffeinate this old body, and then clean and search the floor for the one missing nut and brush cap. Had a catastrophic spill of gatorade last night. Threw towels on everything, and went to bed. This morning I've been picking up what I can, and getting it ready to wash. Sticky from the sugar in the gatorade. Found one nut, and hadn't lost the other brush cap.? I can steal one from the other motor, and ops check, if needed, but I'd rather find the missing bits. I need to clean up this dump anyway.? Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Friday, August 11, 2023 at 08:34:09 PM CDT, Steven Nederhiser <7101sned@...> wrote:
Hello Bill; Mr. Ohmmeter would be my friend in this application. Check the field windings to see if they are good, not shorted. Check the armature for shorts and continuity. I am sure that there is a tutorial on the internet covering this. 95% of the time the armature goes bad. Try eurton electric out in Santa Fe Springs in California. I have sent many items out to them over the years. They also carry brushes, switches, ect. Check the power, fuses, and switch. On Fri, Aug 11, 2023 at 4:55?PM Bill in OKC too via <wmrmeyers=[email protected]> wrote:
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Re: OT-how to test and repair DC brushed motors.
Yep. That's what we call "micky-mousing" something. I grew up not too far from Disneyland! Dad and Grandpa were great at it! William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Friday, August 11, 2023 at 06:49:02 PM CDT, mike allen <animal@...> wrote:
??? ??? push comes to shove , ya can gut the motor take the armature off the shaft & put the shaft back in & power the shaft from another motor . ??? You'd be surprised at some of the things we've done to keep things workin . Years ago my bud scores a 4 cylinder compressor from his wife's boss , he was a dentist . The motor had burnt up in this compressor so they bought a new one & passed the burnt on over to my bud . Did the same thing here ,? tore the motor apart emptied the armature shaft & then installed a pulley in the shaft & cut a notch in the motor housing . Then I found a nice piece of scrap plate in my someday pile &
mounted a motor on it & bolted the plate under the old motor ,
ran a belt from new motor to new pulley on the shaft from the old
motor & the rest is history . ??? ??? Yer half way there already with the bad motor . ??? anmal On 8/11/23 3:55 PM, Bill in OKC too via
groups.io wrote:
Unless I want to completely
redesign it, I need the right-angle gear box. I'm not
qualified for that! I could probably put a different gear
box on it, but none of the ones I've found are near the
right size. Too big, or too small, nothing in the Goldilocks
zone. I do have a Leeson DC motor and probably some spare
brushes for larger motors from my former work, that they
trashed. All I have to do is find them. IF I can find
something, I can probably cut it down if it's not the right
size already. I am good at micky-mousing something...?
Bill in OKC
William
R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by:
Good judgement comes from experience.
Experience comes from bad judgement.?
SEMPER GUMBY!
Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect
in one hand, expectorate in the other. See
which one gets full first.
On Friday, August 11, 2023 at 01:39:17 PM CDT, mike
allen <animal@...> wrote:
??? ??? Just tossin this out there , with no load on
the motor you will not get the actual amp reading .
Also unless? you have a good DC clamp meter most DVM
that do amps top out at 10 amps . ?? ??? I thought there was a guy in this group that had a motor shop ?? Does the motor absolutely have to have the right angle gear box or can it be a straight gear reduction motor ? ??? ??? animal On
8/11/23 9:02 AM, Bill in OKC too via groups.io wrote:
SWMBO' s power wheelchair lift crapped out the other
day. New motor is no longer available since the lift is
ancient. Manufacturer of the lift removed any OEM
markings. It's a right- angle gear motor, which I'll
eventually have some photos and dimensions for. This is
the in-and-out motor for a Harmar AL-600 lift that fits
in the back of a van. Near as I can remember it was made
about 2007 or so.?
There is no continuity in the motor, but? othinf seems burned. I pulled it apart and fiddled with it, and got continuity back. Hooked it back up to power trying to get a current draw reading and it spun up and? rapped out again. No continuity again. Brushes look good.? I have a megger for testing? insulation, and an assortment of DVMs and at least one analog voltmeter. Somewhere in the library are a couple of older books on motor testing and repair, but haven't found them yet. Any suggestions for resources? I looked at Grainger & McMaster-Carr, also Amazon & Surplus Center. They have similar gear motors but nothing that looks exactly? right. Most are either way too light or way too heavy. This is a 12vdc motor, could draw as much as 20amps, but probably closer to 10, and could less. There is another motor on it with a different gearbox. Looks to be about the same motor. May fiddle with that, and get a current draw. Found one of these motors for sale on the knoppix site for $600, was $400 from Harmar at one time. Seems a bit fishy to me, and can't afford it anyway.? Gotta get ready to take SWMBO to get fitted for a new CPAP mask, and for both of us to get new CPAP machines. Hope someone can point me in a useful direction. Used to be a bunch of folks whe rebuilt motors & alternators/generators around here. Called one and they don't do DC motors at all, and don't think there's anyone left who does., Any help will be appreciated! Bill in OKC? |
Bill Pendergrass
Bill in OKC too