Metalwork - Lathe and Mill topics

Wednesday, 26 June 2024

Re: [Amateur-repairs] Wanted: Bird 43 wattmeter and slugs #test-equipment

have a good one with 10-30, 25-60, and 100-250 MHz slugs...

PG
k3llh@arrl.net

On 6/25/2024 7:24 PM, Ham Radio wrote:

Looking for a working Bird model 43 watt meter and slug to cover 2-30 MHz at 100 watts.

Please DM me if you have such a meter for sale.

Tuesday, 25 June 2024

[Amateur-repairs] Wanted: Bird 43 wattmeter and slugs #test-equipment

Looking for a working Bird model 43 watt meter and slug to cover 2-30 MHz at 100 watts.

Please DM me if you have such a meter for sale.

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Monday, 24 June 2024

[sherline] Laser/Non-Contact Dial test indicator tool?

Any suggestions for an affordable Laser/Non-Contact Dial test indicator tool? I have tried a lot of searches and found nothing. There are a number of laser measuring tools for large distances (100 feet or more) but they only have accuracy to tenths or perhaps hundredths of an inch but not to Thousandths or ten-thousandths that would be desirable for machinist work. There are paint thickness gauges for under $30 that claim to have such resolution so it can be done cheaply. I have done a lot of searches for a laser or contactless measuring tool to replace my mechanical Dial Test Indicator tool but have found nothing. Suggestions wanted!

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Monday, 19 February 2024

Re: [SouthBendLathe] Set Up my 16" - Test Cut

Brilliant! I'd planned to do the two collar test and the 12" long cut test, but I'm going to add this one to the list, probably at the beginning. Still have to mount my chuck, making the back plate this week.

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Sunday, 18 February 2024

Re: [SouthBendLathe] Set Up my 16" - Test Cut

To be clear once I used the 2 1/2 inch bar and skimmed the final coat, over 9 inches I got measurement error. So roughly within 0.00005". That is crazy good for a machine like this.
--
1969 16" x 6' South Bend Lathe
Garage full of old Mopars........

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Re: [SouthBendLathe] Set Up my 16" - Test Cut

Tailstock ram must also be level. You'll find a lot of tailstock bases worn on the front end from heavy handed operators shoving them around. You might have to shim

it level and then you should shim it so the center is .0005"- .001" high.

If you're only out 2/10's of a thou along the length of that bar....that's as good as that machine is going to be. It's not a Hardinge.

Bill

On Sunday, February 18, 2024 at 07:28:24 AM EST, Chips <sakr4360@sbcglobal.net> wrote:

Assuming the twist is out of the bed here's an easy one to set the tailstock.

Say the diameter of the quill in the tailstock is 1.4985 inches.
Turn a short piece of metal in the chuck to that dimension.
Put the tailstock at the far end and lock it down.
Set up a dial indicator in a tool post and zero it on the piece you turned to 1.4985.
Run the carriage down and put the indicator on the tailstock quill. It should read zero.
Now you just tweak the tailstock alignment screws until it reads 0.
You don't need an x feet long bar to work with, just a 1 inch stub of scrapbinium.

Re: [SouthBendLathe] Set Up my 16" - Test Cut

.0002" taper sounds pretty good on a 55 year old machine.

What are you trying to test because your setup has at least 5 variables?

On 2/16/2024 11:00 PM, Mark Z via groups.io wrote:

Having problems with zeroes! Worst is 0.0002" per inch. Missed a zero there too! Its late............. LOL!
--
1969 16" x 6' South Bend Lathe
Garage full of old Mopars........