Need Info On Reamers

Have you tried this style of adjustable reamer in polyethylene?

Adjustable reamers can be preset to any size, thus allowing for any amount
of spring back. You can start by adjusting it to slightly polish a drilled
hole, and just keep adjusting it out, and making additional passes unitl you
get what you want.

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.

I'll be the first to admit, I don't recall ever using one in polyethylene -
but I have used them with good results in delrin.


"Cy Galley" wrote in message
news:ArVsh.1152041$084.63830@attbi_s22...
Reamers as another said just don't work on these self-lubing plastics. It
just pushes away and then springs back. Sharp over size drills some times
work.



"Maxwell" wrote in message
...

"DonMorrisey" wrote in message
oups.com...
I'm trying to figure out how and where to buy reamers. I need to
create some 5/8" and 1/2" holes in ultra high molecular weight
polyethylene blocks for my control system. The aileron push tubes
slide thorugh the blocks and the aileron actuators mount in the blocks
as well. The mounting component of my aileron actuator is 5/8", so
when buying the .6250" reamer is that already slightly oversized? I
have been told the holes should be oversized by .002". I have looked
for reamers on line but don't know if what I'm buying is the right
size, there is little or no description for them.

Can someone tell me what I should look for in buying these tools and
where may be the best place to do so?

Thanks. Don


You might want to consider adjustable reamers Don.

http://wttool.resultspage.com/search...eamers&x=0&y=0

If the long link won't work, just go to http://www.wttool.com/ and do a
search on adjustable reamers.

"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

"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
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