I have a low end Grizzly table saw which has a arbor speed of 4700. I
switched the motor and arbor pulleys so that the smaller one is now on the
motor. The saw now seems to cut much smoother and has more power. I don't
know what the arbor speed is now with the pulleys switched. Is there any
reason I should not keep the lower speed arrangement?
"Neal" <[email protected]> wrote in message
news:CKYmn.8226$%[email protected]...
>I have a low end Grizzly table saw which has a arbor speed of 4700. I
>switched the motor and arbor pulleys so that the smaller one is now on the
>motor. The saw now seems to cut much smoother and has more power. I don't
>know what the arbor speed is now with the pulleys switched. Is there any
>reason I should not keep the lower speed arrangement?
Ultimately you gained more power. If you are happy with it you are fine.
On Mar 15, 11:27=A0am, "Leon" <[email protected]> wrote:
> "Father Haskell" <[email protected]> wrote in message
>
> news:[email protected]...
> On Mar 13, 11:29 pm, "Neal" <[email protected]> wrote:
>
> > I have a low end Grizzly table saw which has a arbor speed of 4700. I
> > switched the motor and arbor pulleys so that the smaller one is now on =
the
> > motor. The saw now seems to cut much smoother and has more power. I don=
't
> > know what the arbor speed is now with the pulleys switched. Is there an=
y
> > reason I should not keep the lower speed arrangement?
>
> Higher speed gives a smoother finish. =A0Lower speed helps your
> saw chew through harder lumber, like 4 x 4 cocobolo -- albeit
> at a lower feed rate. =A0You can argue either way -- if your saw
> works better with the pulleys swapped, keep them swapped.
>
> You can effectively creat a smoother cut with a slower speed if you use a
> balde with more teeth. =A0The slower you cut the wood the smoother the cu=
t.
Which means less power to each tooth, defeating the
purpose of slowing the blade to gain torque.
For ultrahard lumber like coke, I'd be more interested
in getting it sawn than surface quality. A plane or a scraper
will handle that detail quickly enough.
On Mar 16, 1:59=A0pm, "Leon" <[email protected]> wrote:
> "Father Haskell" <[email protected]> wrote in message
>
> news:5d02544c-7ad0-4fca-9b7a-bb14fa074dea@v20g2000yqv.googlegroups.com...
> On Mar 15, 6:04 pm, Upscale <[email protected]> wrote:
>
> > On Mon, 15 Mar 2010 15:40:05 -0500, "Leon" <[email protected]>
> > wrote:
>
> > >For ultrahard lumber like coke, I'd be more interested
> > >coke?
>
> > Maybe he's referring to Cocobolo.
>
> Right. =A0Everyone screws the spelling. =A0Better to use a
> shorthand name.
>
> Would not the short hand name be Coco? =A0as in Cocobolo vs Coke as in
> CocaCola? =A0:~)
See? You'll *never* hear people wasting arguments
over rosewood or lignum vitae.
On Mar 15, 5:13=A0pm, "J. Clarke" <[email protected]> wrote:
> On 3/15/2010 4:28 PM, Father Haskell wrote:
>
>
>
>
>
> > On Mar 15, 11:27 am, "Leon"<[email protected]> =A0wrote:
> >> "Father Haskell"<[email protected]> =A0wrote in message
>
> >>news:[email protected]..=
.
> >> On Mar 13, 11:29 pm, "Neal"<[email protected]> =A0wrote:
>
> >>> I have a low end Grizzly table saw which has a arbor speed of 4700. I
> >>> switched the motor and arbor pulleys so that the smaller one is now o=
n the
> >>> motor. The saw now seems to cut much smoother and has more power. I d=
on't
> >>> know what the arbor speed is now with the pulleys switched. Is there =
any
> >>> reason I should not keep the lower speed arrangement?
>
> >> Higher speed gives a smoother finish. =A0Lower speed helps your
> >> saw chew through harder lumber, like 4 x 4 cocobolo -- albeit
> >> at a lower feed rate. =A0You can argue either way -- if your saw
> >> works better with the pulleys swapped, keep them swapped.
>
> >> You can effectively creat a smoother cut with a slower speed if you us=
e a
> >> balde with more teeth. =A0The slower you cut the wood the smoother the=
cut.
>
> > Which means less power to each tooth, defeating the
> > purpose of slowing the blade to gain torque.
>
> > For ultrahard lumber like coke, I'd be more interested
> > in getting it sawn than surface quality. =A0A plane or a scraper
> > will handle that detail quickly enough.
>
> Torque is a function of diameter, not a function of the number of teeth.-=
Hide quoted text -
>
> - Show quoted text -
Torque is also a function of force. Diameter (radius, actually)
is only half of the equation.
"Neal" wrote:
>I have a low end Grizzly table saw which has a arbor speed of 4700.
>I switched the motor and arbor pulleys so that the smaller one is now
>on the motor. The saw now seems to cut much smoother and has more
>power. I don't know what the arbor speed is now with the pulleys
>switched. Is there any reason I should not keep the lower speed
>arrangement?
--------------------------------
No.
Lew
In article <[email protected]>,
Leon <[email protected]> wrote:
> Ultimately you gained more power.
Err, no.
You have gained more torque, the power remains the same (ignoring
transmission losses)
On Mar 15, 6:04=A0pm, Upscale <[email protected]> wrote:
> On Mon, 15 Mar 2010 15:40:05 -0500, "Leon" <[email protected]>
> wrote:
>
> >For ultrahard lumber like coke, I'd be more interested
> >coke?
>
> Maybe he's referring to Cocobolo.
Right. Everyone screws the spelling. Better to use a
shorthand name.
On Sun, 14 Mar 2010 08:32:15 -0500, dpb <[email protected]> wrote:
>Lew Hodgett wrote:
>...
>
>>> ... I don't know what the arbor speed is now with the pulleys
>>> switched. ...
>
>If you knew it originally, then the new speed is the ratio of the
>diameter changes between the original sizes and the new times that.
I would think you want your sawblade teeth moving within a certain
range. A faster speed for less dense wood, and a slower speed for the
harder woods.
"Father Haskell" <[email protected]> wrote in message
news:5d02544c-7ad0-4fca-9b7a-bb14fa074dea@v20g2000yqv.googlegroups.com...
On Mar 15, 6:04 pm, Upscale <[email protected]> wrote:
> On Mon, 15 Mar 2010 15:40:05 -0500, "Leon" <[email protected]>
> wrote:
>
> >For ultrahard lumber like coke, I'd be more interested
> >coke?
>
> Maybe he's referring to Cocobolo.
Right. Everyone screws the spelling. Better to use a
shorthand name.
Would not the short hand name be Coco? as in Cocobolo vs Coke as in
CocaCola? :~)
On Mar 13, 11:29=A0pm, "Neal" <[email protected]> wrote:
> I have a low end Grizzly table saw which has a arbor speed of 4700. =A0I
> switched the motor and arbor pulleys so that the smaller one is now on th=
e
> motor. =A0The saw now seems to cut much smoother and has more power. =A0I=
don't
> know what the arbor speed is now with the pulleys switched. =A0Is there a=
ny
> reason I should not keep the lower speed arrangement?
Higher speed gives a smoother finish. Lower speed helps your
saw chew through harder lumber, like 4 x 4 cocobolo -- albeit
at a lower feed rate. You can argue either way -- if your saw
works better with the pulleys swapped, keep them swapped.
Speed is motor speed times the pulley size divided by the other pulley size.
Diameters of each pulley is good enough for government work. :-)
You can swap (in math) and calculate the old speed to check.
Martin
Lew Hodgett wrote:
> "Neal" wrote:
>
>> I have a low end Grizzly table saw which has a arbor speed of 4700.
>> I switched the motor and arbor pulleys so that the smaller one is now
>> on the motor. The saw now seems to cut much smoother and has more
>> power. I don't know what the arbor speed is now with the pulleys
>> switched. Is there any reason I should not keep the lower speed
>> arrangement?
> --------------------------------
> No.
>
> Lew
>
>
>
dpb wrote:
> Lew Hodgett wrote:
> ...
>
>>> ... I don't know what the arbor speed is now with the pulleys
>>> switched. ...
>
> If you knew it originally, then the new speed is the ratio of the
> diameter changes between the original sizes and the new times that.
Dang...sorry for the reply wrong place...thought was/intended to be at
the OP's posting. :(
--
Neal wrote:
> I have a low end Grizzly table saw which has a arbor speed of 4700. I
> switched the motor and arbor pulleys so that the smaller one is now on
> the motor. The saw now seems to cut much smoother and has more power.
> I don't know what the arbor speed is now with the pulleys switched....
I realize I inadvertently replied while reading Lew's response so try
again...
As noted there, the speedup/slowdown between two shafts is proportional
to the pulley diameters. To clarify the calculation you need, since you
swapped pulleys, the ratio of speeds is the square of the smaller:larger
diameter since it was a speedup of L/S and is now a slowdown of S/L.
Algebraically, the new speed is S/L/(L/S) --> S/L*S/L --> (S/L)^2
As a rough approximation example using easy numbers, if S = 3" and L =
4" and motor rpm were 3450, originally you had 4/3*3450 = 4600 rpm
blade speed, roughly what you said is supposed to be.
After you swap, it 3/4*3450 = 2600 (approx)
Note that 2600/4600 = .57 which is square of the 3/4 ratio of 0.75.
--
"Leon" <[email protected]> wrote in message
news:[email protected]...
>
> "Neal" <[email protected]> wrote in message
> news:CKYmn.8226$%[email protected]...
> >I have a low end Grizzly table saw which has a arbor speed of 4700. I
> >switched the motor and arbor pulleys so that the smaller one is now on the
> >motor. The saw now seems to cut much smoother and has more power. I don't
> >know what the arbor speed is now with the pulleys switched. Is there any
> >reason I should not keep the lower speed arrangement?
>
> Ultimately you gained more power. If you are happy with it you are fine.
>
No he didn't. His saw has the same power as before - the HP of the motor.
To gain more power you have to put a motor on which has higher HP rating.
He did gain more torque at the blade, at the expense of lower rpm, and as you
stated if he is happy ...
Art
On 3/15/2010 4:28 PM, Father Haskell wrote:
> On Mar 15, 11:27 am, "Leon"<[email protected]> wrote:
>> "Father Haskell"<[email protected]> wrote in message
>>
>> news:[email protected]...
>> On Mar 13, 11:29 pm, "Neal"<[email protected]> wrote:
>>
>>> I have a low end Grizzly table saw which has a arbor speed of 4700. I
>>> switched the motor and arbor pulleys so that the smaller one is now on the
>>> motor. The saw now seems to cut much smoother and has more power. I don't
>>> know what the arbor speed is now with the pulleys switched. Is there any
>>> reason I should not keep the lower speed arrangement?
>>
>> Higher speed gives a smoother finish. Lower speed helps your
>> saw chew through harder lumber, like 4 x 4 cocobolo -- albeit
>> at a lower feed rate. You can argue either way -- if your saw
>> works better with the pulleys swapped, keep them swapped.
>>
>> You can effectively creat a smoother cut with a slower speed if you use a
>> balde with more teeth. The slower you cut the wood the smoother the cut.
>
> Which means less power to each tooth, defeating the
> purpose of slowing the blade to gain torque.
>
> For ultrahard lumber like coke, I'd be more interested
> in getting it sawn than surface quality. A plane or a scraper
> will handle that detail quickly enough.
Torque is a function of diameter, not a function of the number of teeth.
On 3/15/10 7:51 PM, Father Haskell wrote:
> On Mar 15, 6:04 pm, Upscale<[email protected]> wrote:
>> On Mon, 15 Mar 2010 15:40:05 -0500, "Leon"<[email protected]>
>> wrote:
>>
>>> For ultrahard lumber like coke, I'd be more interested
>>> coke?
>>
>> Maybe he's referring to Cocobolo.
>
> Right. Everyone screws the spelling. Better to use a
> shorthand name.
How could anyone screw up the spelling of Cocabollo?
--
-MIKE-
"Playing is not something I do at night, it's my function in life"
--Elvin Jones (1927-2004)
--
http://mikedrums.com
[email protected]
---remove "DOT" ^^^^ to reply
On Mon, 15 Mar 2010 15:40:05 -0500, "Leon" <[email protected]>
wrote:
>For ultrahard lumber like coke, I'd be more interested
>coke?
Maybe he's referring to Cocobolo.
"Artemus" <[email protected]> wrote in message
news:[email protected]...
>>
> No he didn't. His saw has the same power as before - the HP of the motor.
> To gain more power you have to put a motor on which has higher HP rating.
> He did gain more torque at the blade, at the expense of lower rpm, and as
> you
> stated if he is happy ...
> Art
Well thank you for pointing that out. But I think everyone will agree that
the saw will be less likely to stall, similar to a saw with a higher hp
motor.
"Father Haskell" <[email protected]> wrote in message
news:017ea313-299e-436c-8d3d-e12a98795af7@i25g2000yqm.googlegroups.com...
Which means less power to each tooth, defeating the
purpose of slowing the blade to gain torque.
Actually you can simply cut at a slower rate, that accomplishes the same
effect as a blade with more teeth.
For ultrahard lumber like coke, I'd be more interested
in getting it sawn than surface quality. A plane or a scraper
will handle that detail quickly enough.
coke?
"Father Haskell" <[email protected]> wrote in message
news:[email protected]...
On Mar 13, 11:29 pm, "Neal" <[email protected]> wrote:
> I have a low end Grizzly table saw which has a arbor speed of 4700. I
> switched the motor and arbor pulleys so that the smaller one is now on the
> motor. The saw now seems to cut much smoother and has more power. I don't
> know what the arbor speed is now with the pulleys switched. Is there any
> reason I should not keep the lower speed arrangement?
Higher speed gives a smoother finish. Lower speed helps your
saw chew through harder lumber, like 4 x 4 cocobolo -- albeit
at a lower feed rate. You can argue either way -- if your saw
works better with the pulleys swapped, keep them swapped.
You can effectively creat a smoother cut with a slower speed if you use a
balde with more teeth. The slower you cut the wood the smoother the cut.