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Thanks for all the tips. I put a big "toothpick" into the hole and twisted, and the best I found was 0,6+ pitch on a ca 3 mm hole, and do to the big .xls from Kerry , a 1/8 is very close, and it will be tested out tomorrow. As you can see from the picture, it is a very short hole. So, 55 or 60 deg is not so important. There are some restorations on YouTube , and I will try to contact them for a picture of the head of the screw. Johannes Mexico
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Paul M: I did what you told me. I found a gauge plastic plate from LMS, not used for many years, and tested many screws. All fit in same line : N.F TPI. So the 2 missing screws have to be there. So is this correct: 100 years old Hamburg tool factory used UTS. Johannes Lavoll.
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Replacing the control board
4
Replacing the control board with or without replacing the motor. I like matching the control board the the motor. I found most control boards fail because either dust or pood design. Next is owner playing with board. Voltage spikes can be problem in some location but power strip with protection should work. I found yearly cleaning of boards exstens the life includes my mini lathe control board, welders , PC tower and my home's AC Please comment on your experiences with boards. {The DC motor have about 6 adjustments . Most mini lathes I seen only has 3 you can adjust 1. Low speed 2. High speed 3 . Max Torque. The rest are per set on board like 4. Torque acceleration 5. Breaking 6. Slope speed increase There some boards 6 adjustments 1. Low speed 2. High speed 3 . Max Torque. 4. Torque acceleration 5. Breaking 6. Slope speed increase There are are few more but almost never seen or better way not need a engineering going wild. The brushless has about same thing but a little different Like speed increases is slowly increasing the frequency. I know more but have had must do with brushless.} Dave
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Mini lathe DC motor longevity
15
Look at improve the longevity of the mini lathe motor. I see a lot members having motors problems. Now is from environmental , operator , motor control board or motor errors? FYI There are two basic type use on mini lathes DC motor and brushless aka {electronic 3 phase} motor. This only on the DC type. Please post how fix or you replace motor. Dave
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My.motor.is.behaving.badly. How.do. I inspect the motor? Do I just flip it on its side to get to the motor?
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7x12 Motor Won't Turn On
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Had a crash awhile back while using a milling bit on my Grizzly 7x12 mini lathe. Motor stalled and fuse blew. I put in a new fuse, but motor won't run. Are there any other circuit breakers/fuses that could be the problem? Or, am I looking at a blown motor?
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Locked
Off topic just FYI
2
This just FYI. My temperature for this month was 79°F thank God for AC My mini lathe is a small shop without AC so have to other things. I only bring up heating because it can have a effect on your motors and you. I know some think humans are powerful. The last time I saw heat like this was 1972 when I was working as a iron worker. I did Iron work when I in high school and college. It paid for college and a nice machine shop tools. But outside in the heat. So if born after 1972 you think it is hot. You have to go back 1905 for hotter days. To cool off earth try a few big volcanos this lower to earth temperature by few degrees. I did not know if humans has any thing to do with the temperature increase is about all say on subject. I look pass Dave
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And once the inside gets hot, it takes longer to cool it down, as the insulation keeps the heat in ralphie
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Locked
Double OT Hot Hot Hot
7
Whole lot of “maybes” in that article. Also says the excess water will be up there for “maybe 10-15 years”, while if you read the actual paper is says “maybe 5-10 years”, so who know what orifice the reporter pulled those numbers from. Meanwhile CO2 hangs around for a 1000 years. Maybe people would take notice if we fired off a massive volcano every decade instead. Tony
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I was wondering why fleeling Hot Check tv . No one is letting run my mini lathe.
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There one use I use smalls a lot for painting. Need to cover badway and part lathe you do want dots on. Here simple project that makes a lot women happy back in 1995 the had Painted Yahtzee for the computer. They never made dice for this game. So can make your wife very with your lathe and nes 4 jaw chuck. On the mini lathe you can paint the dice the different colors. Wash off dice using rubbing alcohol. Use your 4 jaw self centering chuck and chuck up the dice for painting. It takes 5 colors using Testors 9146XT Promotional Enamel Paint. Note you buy purple or mix that color. Now just just use tool post to steady your and paint each color let dry between colors. Some dates you need to use white in dots to stand out. You only one on the block with Painted Yahtzee. I have included the paint chat , score pads and rules in PDF in the down load section. /g/7x12MiniLathe/files/99%29%20painted%20Yahtzee%20on%20mini%20lathe%20file I have used the lathe for a lot for painting Dave
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Vevor parts
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The Vevor 7x14 lathe I bought has no parts list and does not always match what is on other mini lathes. The quality of the parts has not always been the best. The keyway in the shaft for the "A" timing gear is not centered and does not allow the gear to go on without a lot of force. I need to prey it off with a screwdriver which takes a lot of one side/other side reps. The plastic timing gear are VERY tight on the shafts. The timing belt has 90 teeth rather then the standard 70. If I knew all of this before I bought it I would have passed on it. Has anyone else had any problems?
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My ok to polish the knives today as long not over 10 minutes. It also 98° in hobby shop at 10:30 today. This what used to polish the knives. Hope you put other uses for your mini lathe here for all to see. Still could not turn the plexiglass rod it take to long in 108° F day. Dave
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I seem to remember some years ago someone had increased the through-bore of the standard 3" 3-jaw chuck, but I can't remember where and didn't find anything in my search. It may have been toolsandmods.com, but that site appears to be defunct now. I was using the lathe last night and the 5/8" bar stock I was using had trouble sliding through the chuck bore. It was really tight. How big can you go without causing issues? I know the screws holding the back cover on are already close to the bore. Mike
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Just plexiglass rod for making game pieces from. First time turning plexiglass All my life has been metals. Any comments Dave
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I've been working on reducing the vibration in my Chinese 8" bench grinder. Adding collars for the inner wheel flanges to rest against and making new flanges (ala Harold Hall's "Tool and Cutter Sharpening"). I was cursing having only the 1" rest, when I re-found the steady rest mod doc in the Files section. Did not have a need for this mod until now. Putting the rest in the mini-mill vise, with the middle slot edge aligned with the left side of the vise, it was just some up and back on the Y to give me a nice opening for my grinder shaft to fit through. I wound up with a generous 0.885", and I could have gone even further, since I left about 1/32" on each side. Maybe one day I'll build a larger rest with a nice flip top like many of the Myford guys have. Mike
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speed control
6
i've followed the thread about changing motors why do we not see reeves drives with a standard ac motor i think they're used on some wood lathes and larger mills i used to work on them for driving positive displacement pumps they're non-electronic and very simple
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Motor swaps?
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It seems like the motor / speed control is a common issue with the 7" and 8" mini lathes, but I don't see many motor / speed control projects discussed. I follow several different small lathe forums as I find info for one is often useful for another. Motor swaps, are a common topic of discussion with other lathes from Unimats to 9x20. Am I just not noticing this here, or is this just not a popular mod with these lathes for some reason.
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Old Posts Showing Up
I am seeing many old posts appearing when I open Unimat site. Any ideas as to what is going on? Or am I missing something? I am seeing old posts as far back as 2010. Dick
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Control boards to look out for
Some very fancy displays today have battery for control board programming. Myself to avoid this type. I was company that had a program board the battery died. The cost of battery is only $0.50 it was CR2032. The reprogram cost $250.00. Happy day for manufacturer get charged again. I do believe companies like this type for more sales. Dave
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