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David_M · 05-13-2022, 02:58 AM

Which gear-hobbing machine do you have? What are its constants? Does it use change gears for the feed-rate?

David_M · 04-25-2022, 06:06 PM

I saw this at McMaster-Carr:

Push-to-Connect Tube Fitting for Air and Water, Straight Adapter with Hex, 5/32" Tube x 1/16 NPT Male | McMaster-Carr

David_M · 04-25-2022, 01:37 AM

Surburban Tool shows one 34" x 34" (I hope your boss is sitting on an extra-fat wallet, though):

MASTER-SINE HEAVY-DUTY SINE PLATES (subtool.com)

David_M · 04-22-2022, 05:29 PM

I don't know anything about the quality or lack thereof of this vise, but I would like to have two -- quality ones -- to use with my vertical band saw and drill presses.

4" Cnc Vise Clamp Vice...

David_M · 04-18-2022, 04:01 PM

This is one of mine. It uses seven ball bearings in a row plus a thrust bearing. It fits over the tail quill with a slight bump-on fit. The bearings are as close as possible to the chuck jaws. It is...

David_M · 04-16-2022, 08:30 AM

Member 10fingers is the Fellows expert. Gear Works Vermont | United States | Gear Works, Inc (gear-shaping.com)

David_M · 03-31-2022, 04:55 PM

The one I posted a link to (post #9) started life as a blank bar that is machinable on the end to be threaded.

https://pbase.com/d_a_v_i_d/image/172472197.png

David_M · 03-31-2022, 06:05 AM

I'll bet carbide could thread it especially if you have to machine it down to get to size. If not, use a tool-post grinder (with a dressed to 60 degree included angle wheel) and grind the threads.

David_M · 03-31-2022, 05:21 AM

Buy something like this: BEAVER TOOL BLANK BAR TOOLHOLDER NO. BB-181, NMTB 50, 1-3/4" KEYED ARBOR DIAM | eBay

Cut the keyed part of the arbor off and thread what's left. Confirm with the seller...

David_M · 03-30-2022, 08:16 PM

Let me respond to EG's questions and some more.

We have a Mazak CNC that we use to bore the 'C hubs'. We bore them slightly undersize and finish with a Sunnen hone to give the sprockets an...

David_M · 03-29-2022, 03:05 PM

We have a recurring need for ANSI 80 (1" pitch) double-row sprockets.
- C hub
- 30 teeth
- We finish the bore to 3.125"

A reasonable price and lead time would be nice.

Any...

David_M · 03-23-2022, 06:58 PM

I want one of the AMD chips that has 64 cores and 128 threads.:) (And very powerful array of NVidia GPU's)

David_M · 03-23-2022, 06:27 PM

I tried the non-printing character: *alt-255*
I signed up on a forum once using non-printing characters. It took a while before anyone noticed. Needless to say, the moderator wasn't amused. He...

David_M · 03-23-2022, 05:29 PM

. .

David_M · 03-21-2022, 10:26 PM

I happened upon this video and thought I'd add its link. I'm not sure about the accuracy of execution, but I appreciate the poster's ingenuity:

(Start at the 14-minute mark)

...

David_M · 03-20-2022, 09:55 PM

Meyer - Class XX Pin Gages - in .0001" Increments - .000020" Tolerance - (Inch) | Judge Tool & Gage

David_M · 02-20-2022, 09:35 PM

Mazatrol Feeds and Speeds Cutting Conditions - YouTube

David_M · 02-13-2022, 01:33 AM

The 1751 Machine that Made Everything - YouTube

David_M · 02-10-2022, 04:49 PM

Take a look at this video about half-nut engagement timing:

Threading Dial Indicator for Metric AND Imperial Threads - YouTube

He adds this to correct a mistake:

In the example at 9:15 I...

David_M · 02-02-2022, 07:00 AM

https://pbase.com/d_a_v_i_d/image/172318432.png

David_M · 01-30-2022, 10:11 PM

7 down to 4.5 is twice as much as 4.5 down to 2.424

David_M · 01-26-2022, 04:39 AM

Is there a K.I.S.S. way to connect the lead screw to the spindle? Nothing but a hollow pulse wheel mounted directly to the spindle, a fiber-optic cable, a servo motor and an analog frequency...

David_M · 01-25-2022, 09:03 PM

Since you'll need to know the rotational position of the lathe's spindle plus lead screw and Z position of the carriage, and you mentioned a GUI, consider having the GUI show an electronic clone of a...

David_M · 01-24-2022, 04:04 AM

Mobile Vactra 2 (practicalmachinist.com)

David_M · 01-22-2022, 03:03 AM

Hey Z,

I just saw a Barber Colman 6-16 with a differential and remembered this post.

5560 barber colman 6-16 | lsmachines

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