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reaming a hole...

8 REPLIES 8
Reply
Message 1 of 9
Anonymous
3967 Views, 8 Replies

reaming a hole...

what's the correct callout for a 1/4" reamed hole 1/2" deep? we use asme
y14.5 standards.

--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity,com

Dell Precision 420 Workstation
Dual 933 MHz Pentium III
WinXP Pro SP1
768 MB RDRAM
PNY Quadro4 750 XGL
nVidia 6.14.01.4351
8 REPLIES 8
Message 2 of 9
A_Friske
in reply to: Anonymous

I'm sure I'll be corrected if I'm wrong, but I believe correct practice is to NOT specify the machining operation, just give the tolerence you'd like them to hold. Their resposibilty would be only to deliver the part as you tolerence it.
-Allen
Message 3 of 9
Anonymous
in reply to: Anonymous

well, alright. i have a 1/4" hole 1/2" deep on my model. so on my drawing do
i just say: Ø.250 RM. .50 DP

--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity,com

Dell Precision 420 Workstation
Dual 933 MHz Pentium III
WinXP Pro SP1
768 MB RDRAM
PNY Quadro4 750 XGL
nVidia 6.14.01.4351

"A_Friske" wrote in message
news:f18cef0.0@WebX.maYIadrTaRb...
> I'm sure I'll be corrected if I'm wrong, but I believe correct practice is
to NOT specify the machining operation, just give the tolerence you'd like
them to hold. Their resposibilty would be only to deliver the part as you
tolerence it.
> -Allen
Message 4 of 9
Anonymous
in reply to: Anonymous

Is the hole also drilled thru past the ream? If so, I would just say

Ø.2500 ~ .50 DP. &
3/16 DRILL THRU

Don't even mention "ream"

--
Dave Jacquemotte
Automation Designer
www.autoconcorp.com



"Mark A. Bystry" wrote in message
news:5A38772D1E12DFB84A1E94623A937FF1@in.WebX.maYIadrTaRb...
> well, alright. i have a 1/4" hole 1/2" deep on my model. so on my drawing do
> i just say: Ø.250 RM. .50 DP
>
> --
> Mark A. Bystry
> Engineer
> Ziggity Systems, Inc.
> mbystry@ziggity,com
>
> Dell Precision 420 Workstation
> Dual 933 MHz Pentium III
> WinXP Pro SP1
> 768 MB RDRAM
> PNY Quadro4 750 XGL
> nVidia 6.14.01.4351
>
> "A_Friske" wrote in message
> news:f18cef0.0@WebX.maYIadrTaRb...
> > I'm sure I'll be corrected if I'm wrong, but I believe correct practice is
> to NOT specify the machining operation, just give the tolerence you'd like
> them to hold. Their resposibilty would be only to deliver the part as you
> tolerence it.
> > -Allen
>
>
Message 5 of 9
Anonymous
in reply to: Anonymous

At our shop we usually put,
Ø1/4 x 1/2" DEEP
L.P.F TO DOWEL
2 PLACES

Where L.P.F is light press fit, P.F. is press fit and S.F.N.S is slip fit no
shake.

Byron
Message 6 of 9
Anonymous
in reply to: Anonymous

ahh, ok. that works. i want a slip fit and that's why i'm reaming.
i'll use your...
Ø1/4 x 1/2" DEEP
S.F.

thanks everyone...


--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity,com

Dell Precision 420 Workstation
Dual 933 MHz Pentium III
WinXP Pro SP1
768 MB RDRAM
PNY Quadro4 750 XGL
nVidia 6.14.01.4351

"Byron Newton" wrote in message
news:2D27C95778C4280072A4AAECC5422C33@in.WebX.maYIadrTaRb...
> At our shop we usually put,
> Ø1/4 x 1/2" DEEP
> L.P.F TO DOWEL
> 2 PLACES
>
> Where L.P.F is light press fit, P.F. is press fit and S.F.N.S is slip fit
no
> shake.
>
> Byron
>
>
Message 7 of 9
rllthomas
in reply to: Anonymous

I agree 100%. Specify the requirements (i.e. tolerance, surface finish etc.), not the process.
Message 8 of 9
Anonymous
in reply to: Anonymous

"I believe
correct practice is to NOT specify the machining operation"

 

I wish it was that way in our shop.  The way
that I would call this out would be:

 

Drill Ø5/16" Thru

Ream Ø.500 x .50" Dp.

1 Total

 

The three place decimal has an implied tolerance of
+/-.002, but in reality, it probably would be +.001/-.000 for a reamed
hole


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
I'm
sure I'll be corrected if I'm wrong, but I believe correct practice is to NOT
specify the machining operation, just give the tolerence you'd like them to
hold. Their resposibilty would be only to deliver the part as you tolerence
it.
-Allen
Message 9 of 9
Anonymous
in reply to: Anonymous

For our shop I would label it as,
Ream .50 Dp
For 1/4 SF Dowel
2 Holes

In the case of a press fit I always drill a thru hole first so they can
knock it out with a punch, I would label that as,
3/16 Drill Thru & Ream .50 Dp
For 1/4 PF Dowel
2 Holes

We build special machines and they know the ream sizes. The only time I
spell out actual ream sizes is if I'm doing tooling that needs to be held to
tolerances that differ from standard.

I use the same structure for c-bored or c-sinked holes such as,
Drill Thru & C-Bore
For 1/4 S.H.C.S.
2 Holes
or
Drill Thru & C-Bore To Depth Shown
For 1/4 S.H.C.S.
2 Holes
For the case of non standard c-bore depths.

I also use spotface diameters in major weldments and label them as,
Drill Thru & Spotface .13 Dp
For 1/4 S.H.C.S.
2 Holes

Note: This labeling practice does not lend itself to easy automation using
hole notes but I like to spell it out for the shop guys. That way they don't
have to interpret 3 numbers to realize I wand a standard 1/4 c-bored hole.
They are going to use a thru drill and a c-bore tool so I try to keep it
simple.




"Mark A. Bystry" wrote in message
news:3313504317DD8EBB2246452071E7A6AF@in.WebX.maYIadrTaRb...
> what's the correct callout for a 1/4" reamed hole 1/2" deep? we use asme
> y14.5 standards.
>
> --
> Mark A. Bystry
> Engineer
> Ziggity Systems, Inc.
> mbystry@ziggity,com
>
> Dell Precision 420 Workstation
> Dual 933 MHz Pentium III
> WinXP Pro SP1
> 768 MB RDRAM
> PNY Quadro4 750 XGL
> nVidia 6.14.01.4351
>
>

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