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Author Topic: Giant sparkplug  (Read 2601 times)
stevehuckss396
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« Reply #15 on: February 25, 2019, 02:15:44 am »

Steve, this is as good as other stuff you made.. Nice work!

Thanks!  I'm real happy with the machine. Turning a 5.250 inch diameter on a lathe with a 3/16 inch wide belt wasn't one of my best ideas.
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EddyCurrent
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« Reply #16 on: February 25, 2019, 09:08:28 am »

I might have to get a cnc lathe now  Cheesy
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Bubba
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« Reply #17 on: February 25, 2019, 18:59:00 pm »

Steve, this is as good as other stuff you made.. Nice work!

Thanks!  I'm real happy with the machine. Turning a 5.250 inch diameter on a lathe with a 3/16 inch wide belt wasn't one of my best ideas.

I guess I don't understand this.. Is that what the lathe has?  How in the hell you can turn any steel stock? I guess baby it with cuts 0.010 per pass LOL.. So, did you modified?

Best Regards.
B
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stevehuckss396
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« Reply #18 on: February 25, 2019, 20:17:12 pm »

No mods to the drive system. It has to be babied at that diameter. Smaller stock it can take normal cuts. Normal for a 9X20 lathe.
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lloydsp
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« Reply #19 on: February 25, 2019, 20:58:52 pm »

Wait, Steve!  You're telling me that a 9x20 lathe has only a 3/16" wide drive belt (less than 1/4" wide)?  Are you sure it's not 3/8"Huh

Lloyd
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stevehuckss396
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« Reply #20 on: February 26, 2019, 00:25:39 am »

Wait, Steve!  You're telling me that a 9x20 lathe has only a 3/16" wide drive belt (less than 1/4" wide)?  Are you sure it's not 3/8"Huh

Lloyd

5mm wide
.197 inch

Yes sir!

Doing normal stuff the belts have lasted me years. This thing is not normal. The blank missed the cross slide by about .050 inches. It's at the absolute top of capacity. I took .010 cuts and it did good. 95% of the work I do is under 1.500 inches and my sparkplug work is under .375 inches so if the belt called the cops I could be charged with abuse.


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« Last Edit: February 26, 2019, 00:29:15 am by stevehuckss396 » Logged
lloydsp
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« Reply #21 on: February 26, 2019, 00:31:07 am »

Holy Cr*p!  I've never heard of such a thing!  It'd have gone back to the vendor the moment I un-packed it, unless I'd picked it up in person after seeing a floor sample.

You should consider retrofitting that thing with wider pulleys, and going to a belt that can handle the loads.

Lloyd
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stevehuckss396
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« Reply #22 on: February 26, 2019, 01:05:20 am »

The belts actually hold up well. My manual lathe is 12 years old and i just gave it to my son with the original belt still on it. It was used often too. I don't sit around watching them rust like a lot of people. I am just doing something that should not be done on that size of machine.
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stevehuckss396
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« Reply #23 on: February 27, 2019, 00:14:25 am »

Just the one picture today. I got the fake threads cut today. 3.500-6tpi is a big thread and at this point I didn't want to make any mistakes so the camera was the last thing on my mind. Only the second time cutting single point threads for me so I was shi!!ing bricks the whole time.


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Bubba
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« Reply #24 on: February 27, 2019, 18:32:39 pm »

Nice. I know what you mean by chasing single point threads.. Usually the last operation Wink Cheesy Grin
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stevehuckss396
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« Reply #25 on: March 10, 2019, 15:49:32 pm »

Got both hex's cut in the base. Starting to look like the real thing now.

More to come soon


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Bubba
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« Reply #26 on: March 10, 2019, 19:43:06 pm »

Oh yeah, it does look good.
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stevehuckss396
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« Reply #27 on: March 12, 2019, 22:22:51 pm »

I knurled the nut today. It was done in an indexer with a 45 degree end mill. Writing the Gcode would have been a giant task so I wrote a wizard in Mach3 so I just need to input some data and the wizard spits out the code for me. If I dont like the angles or number of cuts around the diameter I just need to change that dataand the new code is done in about a second.



https://youtu.be/iZsKedGKNs8


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stevehuckss396
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« Reply #28 on: March 14, 2019, 22:53:10 pm »

The knurled section is completed. 180 cuts .025 deep around the 4.400 diameter. About an hour and a half.


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stevehuckss396
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« Reply #29 on: March 19, 2019, 22:01:43 pm »

Little update:

I have completed the pocket that the control panel will be in. The control panel is made but still needs to be wired. All I need to do is drill one hole and thread it and the machine work on the base will be complete.



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