Baileigh Industrial
#21
Several days ago, I posted about an inexpensive Baileigh bench top DP and was mainly interested in this machine because of the apparent 'electronic' speed variation - trying to understand 'how' this feature can be offered at that price (knowing other electronically speed control DPs ofter sell for $1000 or much more) - SO, looking inside the top (pic below), there is just one belt - thus changing 'pulley' sizes (radii) is not the answer; another thought would be changing the speed of the motor, such as in universal motors inside routers, but my assumption is that an induction motor is used on this DP - any comments would be appreciated.  Thanks - Dave
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Piedmont North Carolina
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#22
That is some type of continuously variable pulley transmission setup. It probably has a stepper motor the varies the width of the pulleys making the belt ride higher or lower in the groove.
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#23
(03-13-2018, 11:10 AM)Dave Mc Wrote: That is some type of continuously variable pulley transmission setup. It probably has a stepper motor the varies the width of the pulleys making the belt ride higher or lower in the groove.

Thanks Dave - since I posted and after your response above, I've been googling some articles on CVT using a pulley system - found the GIF image below HERE which gives me a nice visual explanation - assume that is the pulley setup used on the Baileigh DP - now wondering 'how reliable' this pulley mechanism is - assume has been around for a while, but not commonly used in drill presses in this price range vs. the multiple belts?  Thanks again - Dave
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#24
(03-13-2018, 12:05 PM)giradman Wrote: Thanks Dave - since I posted and after your response above, I've been googling some articles on CVT using a pulley system - found the GIF image below HERE which gives me a nice visual explanation - assume that is the pulley setup used on the Baileigh DP - now wondering 'how reliable' this pulley mechanism is - assume has been around for a while, but not commonly used in drill presses in this price range vs. the multiple belts?  Thanks again - Dave
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It looks like a Reeves drive. Reeves drives are/were commonly used on wood lathes. Some had issues but the issues may have had to do with cheap materials (pulleys would wear) and lack of lubrication.
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#25
that's the same scheme a bridgeport mill uses to change speeds.  They vary the distance between the flanges of the pulley on the controlling end, and the other end has a spring that keeps the tension.  Is it really electronically controlled?  That is not something I would want.  There is a big knob on the side that looks like it might control the speed, if it was electronic they would have used a much smaller knob. Bridgeports have a plastic bushing that gets noisy over time, replacing it is one of the most common repairs made on one of those machines.

I have a cnc bridgeport where the adjustment handle was replaced by an air motor.  I always figured that it would be fairly easy to replace that with a stepper. Not sure how the original control decided what speed they were at, there doesn't appear to be a home switch or anything that would serve a similar function.
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#26
No info here. Just a comment.

I've never seen or heard of this setup & it's fascinating.
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#27
(03-14-2018, 02:47 AM)kurt18947 Wrote: It looks like a Reeves drive. Reeves drives are/were commonly used on wood lathes. Some had issues but the issues may have had to do with cheap materials (pulleys would wear) and lack of lubrication.

(03-14-2018, 05:58 AM)EricU Wrote: that's the same scheme a bridgeport mill uses to change speeds.  They vary the distance between the flanges of the pulley on the controlling end, and the other end has a spring that keeps the tension.  Is it really electronically controlled?  That is not something I would want.  There is a big knob on the side that looks like it might control the speed, if it was electronic they would have used a much smaller knob. Bridgeports have a plastic bushing that gets noisy over time, replacing it is one of the most common repairs made on one of those machines...................

(03-14-2018, 07:28 AM)GlenS Wrote: No info here. Just a comment.

I've never seen or heard of this setup & it's fascinating.

Thanks all for the further comments - spent a couple of hours yesterday reading on CVT (Continuously Variable Transmission) - there seems to be quite a few different engineering designs, so not sure which one is used in the DP under discussion; there is a large knob on the left side (in my first post pic w/ arrows) - would be curious as to the effort needed to turn the knob as the machine is running (recommended in the manual) and also the noise produced - of course, I'm most concerned about reliability - at least w/ multiple belts there is virtually nothing to break but the motor?
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I'm also a recent member of the Sawmill Creek forum and there was a Baileigh sponsor's sub-forum there that now seems defunct - however, there were several contacts and email addresses - I sent a couple of messages w/ the same questions above but have not received an answer.  Dave
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#28
it doesn't change speeds well if the machine isn't running, certainly not increasing speed. Quite possibly damaging the belt if adjusted while stopped. Looking at the picture, I'm really not convinced I understand the exact mechanism, but the rod that holds the top half of the driving pulley looks like it might be a leadscrew/nut arrangement.
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#29
(03-14-2018, 04:01 PM)EricU Wrote: it doesn't change speeds well if the machine isn't running, certainly not increasing speed. Quite possibly damaging the belt if adjusted while stopped. Looking at the picture, I'm really not convinced I understand the exact mechanism, but the rod that holds the top half of the driving pulley looks like it might be a leadscrew/nut arrangement.

Hi Eric - I read the manual for the Baileigh DP and the statement was made to ONLY change the speed when the machine is running; basically, the pulley halves change their opening diameter by moving in a reciprocal fashion so that the single belt is maintained under the same circumference and tension - below is a YouTube animation (believe for an auto or other?) - fascinating concept once I understood the principles.  

BUT, I'm still concerned about how well this works in a DP and holds up under average use?  Dave
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#30
(03-14-2018, 02:47 AM)kurt18947 Wrote: It looks like a Reeves drive.  Some had issues but the issues may have had to do with ... lack of lubrication.

Shopsmith used the Reeves drive.  There is a hole in the sheave into which I drop some sewing machine oil on a regular basis.  The manual is very clear about performing this maintenance.  Do some research on the Shopsmith to determine durability.  The Shopsmith had other issues, but I do not believe durability was one of them, though I may be wrong.
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