Need Info On Reamers

"Morgans" wrote in message
...

"Maxwell" wrote

If he is trying to hold .002" oversize, an oversized drill is going to be
much less predictable, probably more difficult to find and a good bit
more expensive.

The key is the type of bit he is advocating dressing and using.

A wood cutting Forsner style drill bit eliminates any possible springback,
as it cuts only on a straight line from the center to the diameter, and
pretty much level across the hole. It has no flutes to try to dress, and
a small area to dress. It is the ideal bit to re-size.
--
Jim in NC

He didn't say what type of drill bit, and forstner bits do not eliminate any
possibility of spring back, try drilling rubber or felt.

Also, how do you easily resize a forstner bit? Are you sure the others are
not talking
about spade drills?

Try KBC Tools. They're on the 'Net, and have a full line of decimal
reamers, which will fit almost any application.

That said, I would chuck the UHMW in a four-jaw chuck on the lathe
and turn the hole using a really sharp HSS bit.

Dan

wrote in message
ps.com...

Try KBC Tools. They're on the 'Net, and have a full line of decimal
reamers, which will fit almost any application.

That said, I would chuck the UHMW in a four-jaw chuck on the lathe
and turn the hole using a really sharp HSS bit.

Dan


No, ya got lost somewhere Dan. The question at this point is how do you
resize a forstner bit by dressing it, and how could it possibly be the ideal
bit to resize.

"Maxwell" wrote

No, ya got lost somewhere Dan. The question at this point is how do you
resize a forstner bit by dressing it, and how could it possibly be the
ideal bit to resize.


Turn down the outside, or grind down the outside. It is a relatively small
height, and all solid, except for one or two small areas.
--
Jim in NC

"Morgans" wrote in message
...

"Maxwell" wrote

No, ya got lost somewhere Dan. The question at this point is how do you
resize a forstner bit by dressing it, and how could it possibly be the
ideal bit to resize.


Turn down the outside, or grind down the outside. It is a relatively
small
height, and all solid, except for one or two small areas.
--
Jim in NC


You are talking about grinding the OD of one of these bad boys?
http://www.woodcraft.com/family.aspx?familyid=8311

Larger pictu
http://www.woodcraft.com/InhancedIma...?FamilyID=8311

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message
news:faOdnWsiTthUryjYnZ2dnUVZ_qGjnZ2d@wideopenwest .com...
"Morgans" wrote in message
...

"Maxwell" wrote

No, ya got lost somewhere Dan. The question at this point is how do you
resize a forstner bit by dressing it, and how could it possibly be the
ideal bit to resize.


Turn down the outside, or grind down the outside. It is a relatively
small
height, and all solid, except for one or two small areas.
--
Jim in NC


You are talking about grinding the OD of one of these bad boys?
http://www.woodcraft.com/family.aspx?familyid=8311

Larger pictu
http://www.woodcraft.com/InhancedIma...?FamilyID=8311

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

Thanks Geoff, that is the question on my mind too. If you could even find
one that was 11/16, you would have to pull .030 per side off of it to get an
oversized 5/8. If not, you would have to pull .060 per side off of a 3/4. I
don't see how you could do it without a tool grinder.

Maxwell wrote:
"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message
news:faOdnWsiTthUryjYnZ2dnUVZ_qGjnZ2d@wideopenwest .com...
"Morgans" wrote in message
...
"Maxwell" wrote

No, ya got lost somewhere Dan. The question at this point is how do you
resize a forstner bit by dressing it, and how could it possibly be the
ideal bit to resize.

Turn down the outside, or grind down the outside. It is a relatively
small
height, and all solid, except for one or two small areas.
--
Jim in NC

You are talking about grinding the OD of one of these bad boys?
http://www.woodcraft.com/family.aspx?familyid=8311

Larger pictu
http://www.woodcraft.com/InhancedIma...?FamilyID=8311

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

Thanks Geoff, that is the question on my mind too. If you could even find
one that was 11/16, you would have to pull .030 per side off of it to get an
oversized 5/8. If not, you would have to pull .060 per side off of a 3/4. I
don't see how you could do it without a tool grinder.



If you own a bench grinder, drill press or dremel equivalent make a
bracket out of sheet metal, phenolic or hardwood to hold the tool. It
sounds a tad Rube Goldburgish but it can be done. I made a few for
grinding lathe tools.

In the case of a rotating bit you need symmetry as much as size. It
seems to me you coulduse a wood block drilled to accept the tool shaft
at one end and drilled to make a pivot point at the other. A simple stop
like a machine screw could serve as an adjustable stop.

Visit a machine shop some time, you'll see some rather clever widgets
made for a one time use. You never know, they might have exactly what
you are looking for.

Dan, U.S. Air Force, retired

"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote

You are talking about grinding the OD of one of these bad boys?
http://www.woodcraft.com/family.aspx?familyid=8311


Yep/ That's the type.

Make a widget to hold a small angle grinder on its side, with a pivot and a
screw for advancing the grinder a bit at a time. Make it so that it will
work clamped to a drill press table.

Put the drill bit in the drill press, and push the bit up and down past the
spinning grinder. Advance the grinder a bit at a time, and stop to check
the progress often.

It works. I've done it before. I am a bit "Rube Goldbergish" at times.
That comes in handy, for a homebuilder.

Of course, if you know someone who works in a machine shop, he could do the
job in a tenth of the time. Where's the fun in that, though?
--
Jim in NC

"Morgans" wrote in message
...

"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote

You are talking about grinding the OD of one of these bad boys?
http://www.woodcraft.com/family.aspx?familyid=8311


Yep/ That's the type.

Make a widget to hold a small angle grinder on its side, with a pivot and
a screw for advancing the grinder a bit at a time. Make it so that it
will work clamped to a drill press table.

Put the drill bit in the drill press, and push the bit up and down past
the spinning grinder. Advance the grinder a bit at a time, and stop to
check the progress often.

It works. I've done it before. I am a bit "Rube Goldbergish" at times.
That comes in handy, for a homebuilder.

Of course, if you know someone who works in a machine shop, he could do
the job in a tenth of the time. Where's the fun in that, though?
--
Jim in NC

I think you and Dan have had a little too much torpedo juice!