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Yes, another GOP speed changer, (crank mounted to the RightERLover wrote:JB and JPG help solved the/my problem, but look at Skips pics hear/here!!!! Same thing/hint JPG/JB!!! I did the same for nephew? Guess what JPG/JB?
http://mkctools.com/speed%20changer%20setup.htm
)There are two different SC manuals. One shows the crank on the right and the other one shows it on the left. Here is a picture from the other SC manual. This one has a speed chart in it that the other one does not have. It also does not have the troubleshooting page. If you blow the picture up it looks like the speed indicator plate has markings all the way to the upper screw. As some may or may not know the original plates were 1-8. At some point they were changed to 1-5 so the marks don't fill the plate. I wonder if when they went to the 1-5 marking they changed the position of the crank.rpd wrote:Yes, another GOP speed changer, (crank mounted to the RightERLover wrote:JB and JPG help solved the/my problem, but look at Skips pics hear/here!!!! Same thing/hint JPG/JB!!! I did the same for nephew? Guess what JPG/JB?
http://mkctools.com/speed%20changer%20setup.htm
John did point out that they were originally made that way.
That was my initial thought also. However, after looking at both manuals I am not sure that is true. The picture above looks like it has a 1-8 plate. The (Illustrated Parts BreakoutJPG wrote:The floating sheave acquired the step at the bottom at the same time.
The early SC did not have that step, and 'bottoming out' was all the way to the shaft.
That was not a good thing so the step(stop) was added and the 6,7,8 removed from the scale.
I am curious if the speed chart in the '1-8' manual agrees with the later '1-5' manual and if the speed range was greater.
) IPB page from that manual clearly shows the center sheave with the flanges. The second manual does also.I am gonna crawl out on a limb and 'guess' the manual with the 1-8 plate was created after the step was added, but the pix with the plate did not make it into the manual at that time.jsburger wrote:That was my initial thought also. However, after looking at both manuals I am not sure that is true. The picture above looks like it has a 1-8 plate. The (Illustrated Parts BreakoutJPG wrote:The floating sheave acquired the step at the bottom at the same time.
The early SC did not have that step, and 'bottoming out' was all the way to the shaft.
That was not a good thing so the step(stop) was added and the 6,7,8 removed from the scale.
I am curious if the speed chart in the '1-8' manual agrees with the later '1-5' manual and if the speed range was greater.
The manual with the crank on the right and what looks like a 1-8 plate has a speed chart. Curiously the other manual with the crank on the left (1-5 plate???) has no speed chart.
I wonder if the 1-8 plate was an error caught early on. Assuming the sheaves and the belts are the same on both versions you can't go past 5. At 5 one belt is riding at the top and the other one is all but bottomed out.
No matter what the scale was 5 or 8, weren't the low end to high end speeds/RPM the same, just more numbers in between on the 0-8 scale?JPG wrote:I am gonna crawl out on a limb and 'guess' the manual with the 1-8 plate was created after the step was added, but the pix with the plate did not make it into the manual at that time.jsburger wrote:That was my initial thought also. However, after looking at both manuals I am not sure that is true. The picture above looks like it has a 1-8 plate. The (Illustrated Parts BreakoutJPG wrote:The floating sheave acquired the step at the bottom at the same time.
The early SC did not have that step, and 'bottoming out' was all the way to the shaft.
That was not a good thing so the step(stop) was added and the 6,7,8 removed from the scale.
I am curious if the speed chart in the '1-8' manual agrees with the later '1-5' manual and if the speed range was greater.
The manual with the crank on the right and what looks like a 1-8 plate has a speed chart. Curiously the other manual with the crank on the left (1-5 plate???) has no speed chart.
I wonder if the 1-8 plate was an error caught early on. Assuming the sheaves and the belts are the same on both versions you can't go past 5. At 5 one belt is riding at the top and the other one is all but bottomed out.
I really would like to know what speeds were 'published' with the original SC. The range had to be greater.
As for the belt positions at the 1-5 settings being maxed out, that is reasonable with the step limiting the travel. Without the step, the belt travel is greater. The travel of both belts is greater.
I assume from your comment that the speed chart in the '1-8' manual does not list speeds for 6,7,8?
I dont remember the Serial # of my nephews 10 that I set up this past weekend, it has a 0-5 scale on the Speed Changer, but the crank/rod was on the inboard side/HS, I flipped it without trying so see if the SC handle would interfere with the Head Stock locking lever like I encountered.JPG wrote:No.
The 0 to 5 number locations are the same on both plates.
FWIW my 'manual' (1 sheet front/back) has the sheave step AND the control crank on the headstock side. It lists 0-5 speeds(425 - 6800 rpm).
A 1951 brochure shows the control crank on the headstock side and has 425 - 6800 rpm listed.
In my PTWFE(1953) Model 10, the jig saw pix shows a Speed Changer with the control crank outboard away from the headstock. The plate is not readable. Apparently RJC did not like it on the headstock side!
A JUL52 describes 425 - 6800 rpm range and the control crank on the headstock side. Ditto 1951 brochure and 4-53.
A Jan 52 Shopsmith Shavings(#5) shows the control crank outboard away from the headstock(twice).