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Old 09-08-2010, 05:45 PM   #1
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Default edge finder

Hi, im thinking of buying a touch point edge finder thing something cheep around £25 are they any good and if so which one is best.
Thanks



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Old 09-08-2010, 07:04 PM   #2
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Default Re: edge finder

I use mine all the time and find them very accurate, get a shank that will easily fit a common collet, I use a 1/2" one. And they don't work with plasticas as the part needs to be able to conduct electricity.

Got mine from Greenwood Tools but can't see them on their site now.

Jason



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Old 09-08-2010, 09:21 PM   #3
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Default Re: edge finder

MSC/J&L have one left in their stock clearout.

Starrett quality

http://www.mscjlindustrial.co.uk/STC.../product.html#

I have no idea how this type works, but sounds good by looking at the extra info.


Bogs

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Old 09-09-2010, 06:56 AM   #4
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Default Re: edge finder

Bogs I think thats to set you tool height not an edge finder. It works by completing the circuit as the cutter touches the top of the tool and lights up, the tool is an exact height say 2" above the table so you then set your Z axis to 2".

Jason

EDIt looks like the picture or description is wrong, as search for the Starret 827MA comes up with this which is an edge finder
http://www.toolbench.co.uk/Starrett-...0mm-PSTR827MA/
Also if you tend to work in imperial get one with a 0.200" tip as its easy to workout the offset, trying to do it with a 6.0mm tip may be a bit of a pain

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Old 09-09-2010, 07:47 AM   #5
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Default Re: edge finder

Jason,

I have had an imperial Starrett for well over 20 years, and is still as accurate today as the day I bought it.

I noticed that as I was browsing thru their massive clearance list. If it is a tool height setting one then that is a real bargain, because the cheapest I have seen was about 70 squid.

John

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Old 09-09-2010, 12:20 PM   #6
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Default Re: edge finder

I've had one like this for years. I find it works just as good as the expensive ones.

http://www.use-enco.com/CGI/INSRIT?P...&PMPXNO=942655

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Old 09-09-2010, 02:36 PM   #7
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Default Re: edge finder

Quote:
Originally Posted by Bogstandard
I noticed that as I was browsing thru their massive clearance list. If it is a tool height setting one then that is a real bargain, because the cheapest I have seen was about 70 squid.
Yeah, I've got one of those height-finders a friend gave me.. looks identical to the pic but doesn't say 'Starrett' on it anywhere. It works well, especially after I banded an alligator clip and a foot of wire to the base for use on non-conductive materials. Clip the wire to the tool or machine somewhere in that case.

I'm not sure why they cost so much though; it seems like it would be pretty easy to whack one up and surface-grind the tip to set the height.


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Old 09-09-2010, 04:19 PM   #8
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Default Re: edge finder

I made one a while ago because as Shred said, they seem to be over priced for what they are.

Here is the topic link. Just in case you got the urge to make one.
http://www.homemodelenginemachinist....53889#msg53889
PDF file attached to the first post

It's sprung so that if you lower the cutter too much you don't damage the cutter. It could be used on a CNC but it was designed for a manual machine.
It has a buzzer instead of an LED

Cheers,
Phil

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Old 09-09-2010, 04:32 PM   #9
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Default Re: edge finder

Of course there is always the 1/4" dowel and a bit of fag paper
Don

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Old 09-09-2010, 08:59 PM   #10
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Default Re: edge finder

Hi Speedhound,

I have one of those edge finders and got on fairly well with it until the day I wound the table the wrong way and bent it. With a lot of care and patience I managed to straighten it out again in the lathe using a dti. About 2 years ago I treated myself to a laser centre finder and I absolutely swear by it. They are deadly accurate and can also be used for picking up centre punch dots as well as edges and of course you don't have to worry about halving the reading, where ever the laser dot is just zero your dials. They are not cheap however but to my mind worth every penny. Heres a link to one company that sells them (usual disclaimer)

http://www.chronos.ltd.uk/cgi-local/...3aLCEFP#aLCEFP

heers

Rich



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