LumberJocks

1" x 8 tpi spindle tap question

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Chris posted 06-30-2011 08:57 PM 4275 views 0 times favorited 6 replies Add to Favorites Watch
View Chris's profile

Chris

188 posts in 2776 days


06-30-2011 08:57 PM

Topic tags/keywords: 1 spindle tap 1x8 tpi spindle tap tap for wooden spindles

I am looking to purchase a 1”x8 tpi spindle tap that is designed to be used for wood and is made or marketed by Beall. I was wondering if the tap was by chance designed to work with a 1” forstner bit for if this tap is designed like all other taps of course an undersized drill size would be used.

Therein lies the dilemma, this tap is designed for woodworkers. i am not presently familiar with any drill bit on the market outside of high speed drill bits that come in such variations of sizes which one may need to use with this tap.

Curious to know if anyone is familiar with this system?

Chris

-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC. http://www.quackycalls.com


6 replies so far

View crank49's profile

crank49

3458 posts in 1661 days


#1 posted 06-30-2011 09:37 PM

1” x 8 tpi is a standard bolt thread for metal. I doubt, if a specialty wood thread existed, that it would use the same identical description as a metal thread. Bellow are standard metal tap and drill sizes.

INCH SIZES -
NATIONAL COARSE

TAP SIZE———DRILL SIZE
1/4-20———————#7
5/16-18——————-F
3/8-16———————5/16
1/2-13———————27/64
5/8-11———————17/32
3/4-10———————21/32
7/8-9————————49/64

1-8————————7/8

1-1/8-7——————-63/64
1-1/4-7——————-1-7/64
1-1/2-6——————-1-11/32

You are in luck. As you can see, the drill size for a 1”- 8 thread is 7/8”. That is a standard Forstner or Brad point drill size.

I saw on Woodcraft’s site they are suggesting tapping a hole in wood to match the standard thread of a lathe spindle, so YES!, this is in fact a standard metal thread size. It is so you can remove the chuck and just screw the wood workpiece onto the lathe in place of the chuck.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View sarahss's profile

sarahss

254 posts in 1339 days


#2 posted 06-30-2011 10:00 PM

I recently checked into it for my Jet Mini lathe with a 1×8 TPI headstock. After talking with Jet and McMaster Carr, they recommended this, but I haven’t ordered it yet and don’t know if the “pitch” of the threads would be correct or not.

http://www.mcmaster.com/#2521a581/=cz5j9e

don’t know if you want to spend that much either, but we got the tap & dye set (1×8TPI)—from Grizzly, I think—anyway, the threads the tap cut were not compatible with my lathe headstock.

View David Kirtley's profile

David Kirtley

1281 posts in 1688 days


#3 posted 06-30-2011 11:09 PM

It is a metal tap to match the metal threads. I have one but have not used it yet. I believe the instructions do say 7/8 bit but I would have to go look when I get home.

-- Woodworking shouldn't cost a fortune: http://lowbudgetwoodworker.blogspot.com/

View Chris's profile

Chris

188 posts in 2776 days


#4 posted 07-01-2011 08:46 AM

Thanks guys, i actually called Craft Supplies USA today and spoke with a rep and to reiterate what you guys are saying, the rep said the particular 1×8 spindle tap in question does utilize a 7/8” pilot hole.

So there i go!

Thanks again, Chris

-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC. http://www.quackycalls.com

View bubinga's profile

bubinga

861 posts in 1358 days


#5 posted 07-01-2011 01:22 PM

The 1×8 tap does use a 7/8” bit, a brad point is much better choice, and you can buy it,( and odd sizes) from Beall Tool
The tap you are looking to purchase, has a removable guide on the end,that guides the tap straight
I have made, and tapped wood nuts for 1/2”, 5/8”,3/4”, 1”, 1 1/4” and 1 1/2”, wood bolts.
IMPORTANT: When tapping in wood, clamp in vise to avoid splitting

-- E J ------- Always Keep a Firm Grip on Your Tool

View Chris's profile

Chris

188 posts in 2776 days


#6 posted 07-02-2011 05:17 AM

“IMPORTANT: When tapping in wood, clamp in vise to avoid splitting

—E J”

THanks EJ, with this tidbit i will not have to go through the school of hard knocks in this area. Chris

-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC. http://www.quackycalls.com

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase