Motor is Leeson 3/4hp DC 110v w/ electronic controller , 1750 rpm max.
Motor mount is NEMA C machined from 1/2" plate steel.
Test belt is poly link.Final belt will be 4L (1/2") 4Lxxx depending on final speed ranges I want to be able to use,(
the Maurey drive will handle 185 to 3850 rpm)
Pulley on mtr for test is cheap zinc 5/8" bore x 1/2" x 31/2"
Spindle pulley is Jet factory reeves drive. movement control was retained
Variable Speed Drive.The VSD has nearly the same demensions and operating parameters as the
factory drive,instead of using Maurey system to control the spring sheave,( thats really all a reeves drive is, a
spring loaded split pulley riding on stainless key, the Maurey is sealed and self lubricated, where as the Jet
you HAVE to grease it, the more you shift the more often you have to grease ( not oil ) it and spindle pulley)
the Jet spindle control will work very nicely as the Jet spindle half of its ( the Jet) reeves does the same
thing as the Maurey system ( by moving the motor mechanicaly closer to or further away from fixed out put shaft, they have
a special motor mount that uses a screw jack to move motor mount on rails in and out ,it is pretty neat and may have
applications for Rose Engine Lathe in moving or positioning the cutter motor etc) ( in this case the Jet spindle portion)
.I talked with the engr at work and this is pretty much what he said, the drive in the Maurey system will handle up to 2 hp
, they offer several drives and depending on the hp of the motor which one is used.
So if you have say a 3/4 hp then order the one that corresponds to that hp, a couple of them over lap so I will order
the one for 1 hp as I will be changing again to 1 hp AC 230v with VFD from
http://dealerselectric.com/item.asp?PID=472&cID=75&scID=103 as they have a special and my guess is they are over stocked ( 336$ and free frt) .and no I do not have any
finanical intrest in either of these companies....
The spring in the Maurey has the same tension force as the Jet so as the fixed spindle is shifted to a lower speed (
while running ) the belt forces the two pulley halves apart allowing the belt to drop down ( on the driving pulley)
and achieve a smaller pitch dia, since the spindle pulley is doing the same thing but in this case it is increasing
the pitch dia of the spindle pulley( remember this is lower speed change) . The actuall speed is determined by the
fixed control on the spindle where the stops are placed as the stops hold the control handle in place "
The "throw" on the Maurey drive is nearly the same as the Jet at 1 1/8" so I am hoping the
speed will be close enuf that I can use the Jet plate on the control.The Maurey pitch diameters for the 3/4 and 1 hp
drives : 2.37 " min to 4.84 "max w/ o/a dia at 5". Near as I can tell the Jet is 1.75 min and 4.0 " max with
4.125 o/a dia so the speed ratio is 2.03 vs the 2.05 of the Mvsd,that is close enuf and as the Jet contol sets rpm the speeds
will be the same as the factory setting/s. cool.
The Mvsd would allow one to throttle back the spindle and yet keep the DC up to speed , also let you slow it down to
a crawl for those out of balance blanks and general roughing work and the way I finish with poly u and bowl finish. That is
the part I like, especally on spalted blanks that never really get balanced due to densities of the blank not being consistant.
The Mvsd is used in new construction, where the driven pulley is fixed pitch so ( they also have a manualy operated movable
device for changing the drives pitch with out using the mtr mount ) hence their movable motor mount is used to change
the speed, mostly for fan applications and certain fixed things like refrigeration or where fine tuning of rpm is a must .
A servo or step motor can be attached to the crank screw on their mount and operated via computer/remote switch to
speed up the fan or slow it down( when using a constant speed motor for the drive), and also arrive at the ideal fan
speed for bearing wear / maint, and if fan size cannot be changed but speed and velocity of air flow is more critical. Would
save on not buying DC or AC w/VFD or electonic speed control by several hundred dollars. Perfect for a wood
lathe , especally one where the hs does not move and you could put your motor where ever you wanted it , or say a custom lathe
where you can fine tune the rpm within that 185 to 1723 rpm range using a fixed pulley on the spindle or even a two step pulley
for hi-low ranges ... manually by just turning the wheel on the mtr mount that'd be cheaper than the varible mtrs by
about 700$ less ....and use fixed speed mtr so NO torque loss , no hp loss, no electronics to blow up, burn out or fry the vfd
or the mtr, etc, and still get decent rpm from the spindle. Does anyone see the light coming ON ???? For about 100$ get
a remote digital rpm gauge and put anything under 2 hp to shame.the mount is 105$, the drive is 90$, new belt at 1/2" or 3/4"
say 20$ companion sheave is 45$ , perfect on custom lathe and 500$ to 1000$ cheaper.2 hp 110v mtr 150$ , used,
even better.... 2 pillow blocks w/ brgs , 1 1/4 -8 spindle , some angle iron , buy a commerical tail stock
. sound familiar? 2 hp bowl lathe for Less than 1000$ ( no ts need here) , variable speed, all the swing in the world.
and parts are off the shelf. Imagine full torque at say 50 rpm.
The pulley test was done to achieve the best power to speed ratios but with the discovery of the Maurey these tests are
now moot.
For the test tho , using a 5/8" bore x 1/2" x 3.5 " zinc pulley heres the low down:
Stock belt is 3L230 which is too short , the 240 is too short also.I used the 3L260 for the #2 setting (1250
rpm max) that was the only one the store had in that length and it worked fine.I used a 4L250 for the #4 setting
( 2600 rpm max) as that was all the store had at that length and it worked fine. No shifting of the selector while running is
possible using fixed pitch drive pulley and either of these two belts, as one up was too loose and one down ( on
the Jet speed selector) was too tight. When changing I had to shut down and manualy move the spindle pulley by hand to
the speed position, before changing belts.
the 3L260 works at the 1250 rpm or #2 on the selector, and 4L250 on #4 with little or no noise/rattle. The
link belt work but fingers are sore after adding and removing links as this one had been on my table saw since 1995 and is
somewhat stiff. ( go figure huh?)
MOUNT:
Mount is NEMA C style and I used the Jet mount demensions to fabricate it.The lathe is in a corner up against the wall
so I had no choice where to put it. The head stock still swivels as the bottom of the mount was ground down to clear the bed
ways but now the tool rest extension for off bed turning is limited as the mtr is in the way now ( being 3 1/2 " longer
than the factory AC.If mounted to the left of the HS then the direction of rotation will have to be reversed and the mount
will have to be re-engineered.I used two Grade 8 , 5/16" x 1 1/4" hex bolts w/ flat and lock washers and finish nuts
( no heavy nuts avail in this size here in town ) as I did not want to drill out the holes in the casting and so far no cracking/cracks
, I think I will make a back up or bearing plate to go inside to even out the strain so as not to " break out"
the holes as the DC is about 6 lbs heavier and the extension addes another 1lb. Plus the nuts and bols add some...
SPINDLE EXTENSION:
I made a 3" extension ( chrome moly was tough threading ) but was too short ...my mistake (???) yea I know measure
many times ... cut once thingy.... It should have been 3.5 inches long , anything over 9" dia, I have to put the
extension on ( if the ext was at 3 1/2", no need to remove shroud) and take off the fan shroud and fan to clear the
blank, once the blank is roughed and reversed ( for say a bowl) I can put the stuff back on, In 2 hrs of turning the DC did
not get nearly the heat rise the AC does so that was / is not a concern at this time,(permenant magnets stay way cooler) I
do have a thermometer on the mtr and can keep an eye on it.
All together it cost me :
1/2-16 x 1 1/4" hex bolts w/ fw ( I got those in SS with the motor) or 3$ approx plus small Loc-Tite tube for mtr
bolts 2.95$
1.40$ nuts bolts washer/s
As for parts and machine time ( with me doing machine work ( I paid for machine time) ,1 1/2 hrs ,
stress proof extension ( no chrome molly) , motor mount plate and machining / drilling, welding , grinder and cutting
torch ) My guess is about 100$ at shop rates plus parts. If I were going to make the kit it
would be 150$ to 175$ for : mount,spindle ext ,bolts/nuts/washers/ bearing plate/4 motor bolts and flat washers 1/2"-16
x 11/4"
Belt/s $5.99 each.
pulley fixed 3.5'', 12.95$. or Maurey drive add about 95$ to 110$
cone pulley 24.95 $ (3- 4 speed) ( 6 speed more $)
If you had the install kit made and bought mtr and drive , my guess is :
about 100$ to 200$ for manual and 300$ with Maurey drive, motor new/used $? , control for 3/4 hp DC
about 150$ or the 1 hp AC w/ VFD from "dealers" at 336$ free frt( 2 hp is 450$) plus wiring, ac filter/regulator
75$ ,1000 jouel surge suppresor , emergency shut off ,misc stuff maybe about another 50$.
600$ to 900$ all total.
