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Posted by moray on August 14, 2008, 11:37 am
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> moray wrote:
>>> Hi,
>>>
>>> I want to drive a milling machine spindle from a motor, and think a belt
>>> drive is the best way to go.
>>>
>>> Question is, how do I work out what belt to use?
>>>
>>> The motor runs at 10,000 rpm and a 1:3 ratio sounds good. 600 W, one
>>> problem might be that the shaft centers are 3" apart.
>>>
>>> Any suggestions? Thanks,
>>>
>>> -- Peter Fairbrother
>>
>> According to Gates DFpro, it's doable with toothed belts/pulleys.
>>
>> Link below shows the possible combinations.
>> http://farm4.static.flickr.com/3111/2759234739_3f02e721d4_o.gif
>>
>> moray
> Thanks.
>
> I may go with a poly-vee belt instead, but that's useful to know.
>
> -- Peter Fairbrother
DFpro didn't find any workable solutions using their range of
v-belts/pulleys.
It did come up with 2 'problem' drives, but I never actually looked to see
why they didn't work.
moray
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Posted by Norman Billingham on August 13, 2008, 12:45 pm
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> Hi,
>
> I want to drive a milling machine spindle from a motor, and think a belt
> drive is the best way to go.
>
> Question is, how do I work out what belt to use?
>
> The motor runs at 10,000 rpm and a 1:3 ratio sounds good. 600 W, one
> problem might be that the shaft centers are 3" apart.
>
> Any suggestions? Thanks,
If the shaft centres are 3" apart and the radii of the two pulleys are r1
and r2 then you need r1 + r2 = 3 (give or take a bit for clearance)
If you want a speed reduction of 3 then the circumference of one pulley has
to be 3 times the other so r1 = 3 x r2
So we have 3r2 + r2 = 3 or 4r2 = 3 or r2 = 3/4"
and r1 = 3 - r2 = 2 1/4.
So a 1.5" diameter pulley driving a 4.5" diameter gives you your speed ratio
and a 3" separation of centres.
Sounds perfectly do-able with poly-V drive, though you'll have to settle for
slightly smaller pulleys to allow for a bit of clearance? You also need
some movemenrt somewhere to allow setting up of belt tension if you go that
route.
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Posted by Steve on August 13, 2008, 4:00 pm
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"Norman Billingham" <norman.at.tumulus.org.uk> wrote in message
>
>> Hi,
>>
>> I want to drive a milling machine spindle from a motor, and think a belt
>> drive is the best way to go.
>>
>> Question is, how do I work out what belt to use?
>>
>> The motor runs at 10,000 rpm and a 1:3 ratio sounds good. 600 W, one
>> problem might be that the shaft centers are 3" apart.
>>
>> Any suggestions? Thanks,
>
>
> If the shaft centres are 3" apart and the radii of the two pulleys are r1
> and r2 then you need r1 + r2 = 3 (give or take a bit for clearance)
>
> If you want a speed reduction of 3 then the circumference of one pulley
> has to be 3 times the other so r1 = 3 x r2
>
> So we have 3r2 + r2 = 3 or 4r2 = 3 or r2 = 3/4"
>
> and r1 = 3 - r2 = 2 1/4.
>
> So a 1.5" diameter pulley driving a 4.5" diameter gives you your speed
> ratio and a 3" separation of centres.
>
> Sounds perfectly do-able with poly-V drive, though you'll have to settle
> for slightly smaller pulleys to allow for a bit of clearance? You also
> need some movemenrt somewhere to allow setting up of belt tension if you
> go that route.
>
>
>
I used a poly-V belt to drive a countershaft from the motor on my lathe, I
manufactured both driver and driven pulley using the JohnS "tap in the tool
post" method to cut the grooves. The difference in the thread angle and
the belt "v" angle has proven to be a non issue in real life use.
The other nice thing here is you can choose any odd ball diameters of pulley
to suit your need and they are easy to make.
Steve
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Posted by Peter Fairbrother on August 13, 2008, 9:23 pm
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Steve wrote:
[...]
> I used a poly-V belt to drive a countershaft from the motor on my
> lathe, I manufactured both driver and driven pulley using the JohnS
> "tap in the tool post" method to cut the grooves.
I'd ask about that, but it seems obvious enough. Only problem, where can
I get a 0,092"/ 2.34 mm pitch tap? What tap did you use?
The difference in
> the thread angle and the belt "v" angle has proven to be a non issue in
> real life use.
Good to know.
I rather fancy a belt drive which will slip if something goes >clonk!<,
rather than a timing-type notched belt.
Seems a 12" 6- or 8- rib PJ section belt would do the job, but where do
I get one? Maybe my google-fu is weak today, but I'm having no luck :(
-- Peter Fairbrother
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Posted by John S on August 14, 2008, 4:15 am
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> Steve wrote:
>
> [...]
>
> > I used a poly-V belt to drive a countershaft from the motor on my
> > lathe, =A0 I manufactured both driver and driven pulley using the JohnS
> > "tap in the tool post" method to cut the grooves. =A0
>
> I'd ask about that, but it seems obvious enough. Only problem, where can
> I get a 0,092"/ 2.34 mm pitch tap? What tap did you use?
>
> -- Peter Fairbrother
Use an 11 tpi Whitworth form pipe tap of Coventry die insert.
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