Tool Talk

What's-It Forum => What's-It Forum => Topic started by: BigTexasYardSale on April 03, 2018, 06:05:25 PM

Title: Weird Threaded Thingy
Post by: BigTexasYardSale on April 03, 2018, 06:05:25 PM

One end is a 3/8" square hex drive, OAL 4-3/4".  Odd combination of coarse and extremely fine threads- the coarse are RH while the fine are LH.  Almost like a micrometer adjustment thread.  It was in a bag hand marked R175-P2.  Some kind of replacement part? 

Title: Re: Weird Threaded Thingy
Post by: toolman on April 04, 2018, 08:11:55 AM

My first WAG is a mandrel. For what?, i don't know yet, but will look for it.

Title: Re: Weird Threaded Thingy
Post by: leg17 on April 04, 2018, 10:14:53 AM

Is the fine thread left handed?

Title: Re: Weird Threaded Thingy
Post by: Papaw on April 04, 2018, 01:39:03 PM

Doesn't look like it is threaded, but if it is- perhaps it is part of a puller of some sort.

Title: Re: Weird Threaded Thingy
Post by: Bill Houghton on April 04, 2018, 03:22:38 PM

Is it all one piece, or does the square part turn a shaft inside the fine-threaded part?  If it does, could it be the core of a Greenlee-type punch?
(https://greenlee-cdn.ebizcdn.com/full/76BB.jpg)

Title: Re: Weird Threaded Thingy
Post by: international3414 on April 04, 2018, 04:47:48 PM

machine shop project?

Title: Re: Weird Threaded Thingy
Post by: lptools on April 05, 2018, 06:55:24 AM

Possibly the guts of an Adjustable Blade Reamer???  Regards, Lou

Title: Re: Weird Threaded Thingy
Post by: JohnD on April 05, 2018, 11:57:34 AM

No size reference so I'm guessing a bit but it looks like the center shaft for a "ridge reamer" for engine cylinder bores. I've used several different types but I think they had a hex rather than square drive. The course thread part expands the 3 support legs to anchor tool in bore. The cutter assembly mounts and turns (with large wrench or socket) on the fine thread portion. The fine pitch works like the lead screw on a lathe to feed cutter a certain amount with every turn. Will try to attach a pic from eBay.

Title: Re: Weird Threaded Thingy
Post by: oldgoaly on April 05, 2018, 02:07:03 PM

Those course threads on the one end are throwing me, a handle? or threaded in to something like a fixture for a ???? mill, lathe, grinder??

Title: Re: Weird Threaded Thingy
Post by: BigTexasYardSale on April 05, 2018, 05:10:49 PM

Quote from: JohnD on April 05, 2018, 11:57:34 AM

No size reference so I'm guessing a bit but it looks like the center shaft for a "ridge reamer" for engine cylinder bores. I've used several different types but I think they had a hex rather than square drive. The course thread part expands the 3 support legs to anchor tool in bore. The cutter assembly mounts and turns (with large wrench or socket) on the fine thread portion. The fine pitch works like the lead screw on a lathe to feed cutter a certain amount with every turn. Will try to attach a pic from eBay.

Ding-Ding-Ding, I think we have a winner!  Nice job and thanks John.  The super fine thread pitch makes perfect sense now- its like the feed rate for a hand driven boring bar.