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Feeds per inch on a Logan 400

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Logan 400

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The change gear chart shows the slowest speed is .0046. After studying the ratios I changed a couple of gears and I have it down to about .0028. It still seems too fast for steel. Should I study my tooling or do I need to slow it down some more? Thanks for any input.
Jay
 

stupoty

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I think my lathe goes down to 0.0025 per rev, gives nice finish, I tend to rough faster, up to about 0.018 per rev. depends on how rigid the set up is and depth of cut etc.

Stu
 

Nogoingback

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I would just give it a try with the steel you normally use and see what you get.
 

Logan 400

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I tried it on aluminum and steel. Aluminum was fair but too fast for steel. I ordered another gear so I'll give that a try when it arrives next week.
 

MarkM

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.0046" is slow enough for a decent finish cut. Do you have a radius on your tool. Check if your tool is on centre accurately. Take a face cut and make sure it s not leaving a pip or pushing the pip off.
 

Logan 400

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I believe I am dead on center but will try a face cut to verify. I tried several tools but I did not try sharpening them. I only tried it out for a few minutes. I have been feeding everything by hand and just started setting up the carriage feed.
 
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Logan 400

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Problem solved. It was a number of things. 1) I read the dial indicator wrong. Was actually reading . 0034 2) The tools needed sharpening. 3)The round stock I was using just would not turn smooth. I installed the new to me gear and sharpened a couple of tools and gave it another try with a different piece of round stock. I like the finish cut I am getting now. The feed is .0024 per rev.
 

Hoyt

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What were the gears you finally used?
 

rambin

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i know the best you can get on the old 700 wards is .0046 which is kinda too fast. but you've cut that in half at .oo24 I would think that would be a nice finish..
 

Logan 400

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I will have to look to answer your question. I do remember I also had to buy a small gear. I'm out of town for a couple of days but I'll look when I get home.
Jay
 

rambin

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hmm my logan 700 chart is different I guess.. lowest I can get is 46 thou per inch. I thought all the logans used a pretty similar gear train.
 

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Logan 400

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I have the same chart but notice the gears I used.
 

rambin

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ahh your saying you came up with a different array then what logan did.... I guess I just figured they showed every probable option to get the best feeds available
 

wa5cab

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Rambin,

The slowest feed shown on the chart that you attached is four point six thou per inch, not forty-six.
 

rambin

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ahh my math aint so good... regardless logan 400 has found a combination to go even slower I will have to see if I have the gearing to do it at some point
 
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