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Forum topic by Jerome posted 09-08-2021 05:48 PM 493 views 0 times favorited 13 replies Add to Favorites Watch
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Jerome

163 posts in 3345 days


09-08-2021 05:48 PM

Topic tags/keywords: lathe center finder

Hello all!

A friend recently told me about a 4-prong adjustable finder tool for marking the center of squares or rectangles. This product included a punch to mark the center. Does anyone know anything about this sort of product? Would it be better to make my own? Thanks!

-- Jerome, Marietta, GA


13 replies so far

View BurlyBob's profile

BurlyBob

9293 posts in 3481 days


#1 posted 09-08-2021 06:01 PM

Mark a line from corner to corner. Where they cross is the center. Use an awl to mark it. Super simple and cheap.

View therealSteveN's profile

therealSteveN

8656 posts in 1790 days


#2 posted 09-08-2021 06:37 PM



Mark a line from corner to corner. Where they cross is the center. Use an awl to mark it. Super simple and cheap.

- BurlyBob

Exactly, only slightly harder to do rounds, and odd shapes, Look at the edges, you should be able to pick good approximations of quarters of whatever you are marking. For a lathe mount just keep in mind even with a marked centerpoint, at the start this doesn’t guarantee a balanced load, so start slow speed, and always wear face protection. DAMHIKT. :-)

I think to pay for something that may prove to be difficult to hold in place over just a straight straightedge isn’t a good buy. In order for it to be universal I would think it would have to move, and trying to rein in 4 moving arms, and at the same time hold it right there may prove difficult.

-- Think safe, be safe

View Fred Hargis's profile

Fred Hargis

7197 posts in 3709 days


#3 posted 09-08-2021 07:07 PM

Are you referring to something like this? No punch for the center, tho’.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Lazyman's profile

Lazyman

7824 posts in 2603 days


#4 posted 09-08-2021 07:49 PM

For rectangles, the corner to corner method will work on any size as long as your straight edge is long enough. I have one like Fred linked to and if the pieces isn’t a perfect square you have to mark mark lines from each corner and the center is somewhere in a square formed by all 4 lines cross. It works best with round shapes.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View Jim Jakosh's profile

Jim Jakosh

26656 posts in 4321 days


#5 posted 09-08-2021 08:41 PM

The tool that Fred showed is good for finding center of rounds. for Square or rectangle, the lines from corner to corner are the simplest and work great. I have never seen a 4 pronged tool to do that. It must be something the equalizes in 2 directions and has a punch in the center. It must be made from Unobtainium!

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View Phil32's profile

Phil32

1561 posts in 1119 days


#6 posted 09-08-2021 08:58 PM

There is a simple V-shaped head for a mechanic’s square which places the rule as bisecting its V. Several lines drawn along the rule with the V-head against the edges at various points will bracket the centerpoint. Sorry, no photo. Just do a Search on “centering head for mechanics square.”

-- You know, this site doesn't require woodworking skills, but you should know how to write.

View Woodnmetal's profile

Woodnmetal

116 posts in 61 days


#7 posted 09-08-2021 09:32 PM

A tool that can probe all 4 corners at the same time, be it square or rectangular, automatically center the work piece, then center punch sounds slick.
My question…. would the part be ready to place in a 4 jaw chuck, push the live center up to the center punch and way ya go or?

That would probably scare me for a second haha…. But I’m still with ya here, spinning er’ slow at 100rpm just in case.

Heck,
I will throw my Noga mag base, interapid indicator, Starrett caliper and automatic center punch aside for that on my old manual lathe for that deal.

CNC probe capability aside here…

Please post a link…
I want 2 of them.

Gary

-- I haven't changed... but I know I'm not the same.

View Roger10's profile

Roger10

7 posts in 1789 days


#8 posted 09-09-2021 03:41 AM

The device is called “The Squid” centering punch. You can find it on Amazon or Woodcraft.

View TheDane's profile

TheDane

6007 posts in 4879 days


#9 posted 09-09-2021 03:57 PM

Hmmm … $60 + S&H

I’ll stick with my cheap plastic center finder.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View Fred Hargis's profile

Fred Hargis

7197 posts in 3709 days


#10 posted 09-09-2021 04:42 PM

Interesting, I’ve not seen that one before.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Karda's profile

Karda

3364 posts in 1770 days


#11 posted 09-15-2021 07:11 AM

can you use the plastic center finder on rounds that are not perfectly round

View MikeB_UK's profile

MikeB_UK

683 posts in 2251 days


#12 posted 09-15-2021 08:59 AM

That squid only marks the mid point though, not the centre point.

This looks like it would work – you’d have to make it yourself though
https://www.thingiverse.com/thing:16603

-- Be yourself; everyone else is already taken.

View Fred Hargis's profile

Fred Hargis

7197 posts in 3709 days


#13 posted 09-15-2021 10:24 AM



can you use the plastic center finder on rounds that are not perfectly round

- Karda


You can, but it pays to move the tool around and make several marks, They won’t cross in exactly the same place, so you use the center of those cross marks.

-- Our village hasn't lost it's idiot, he was elected to congress.

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