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Type: Posts; User: basalt

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  1. Replies
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    1,627

    Thanks Dave, for answering my post--I might give...

    Thanks Dave, for answering my post--I might give that a try.
  2. Replies
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    1,627

    Craftex Mini lathe Stalling

    Hi guys, I hope someone can offer me some advice.
    Does anyone know how to adjust these 3 screws to get the lathe to have more power at low speed so it doesn't keep stalling? I have tried turning...
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    Craftex Mini lathe Stalling

    Hi guys, I hope someone can offer me some advice.
    Does anyone know how to adjust these 3 screws to get the lathe to have more power at low speed so it doesn't keep stalling? I have tried turning...
  4. 3rd Quarter Machining

    Asking an apprentice to machine this part in 1 1/2 hrs I think is unreasonable. I could do it in 1/2 hr. as a machinist with 30 years experience with all my tools ground and at the ready. If the...
  5. All gears need backlash, just touching is too...

    All gears need backlash, just touching is too tight, by holding one gear stationary and wiggling the other gear there should be some noticeable play. Sometimes the bore of the gear(s) aren't...
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    929

    You can trust the 3 wire measurement providing...

    You can trust the 3 wire measurement providing your thread profile is correct--the tool is ground to exactly 60 degrees, it has zero back/side rake, it is exactly on centre and is perfectly...
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    1,390

    First you must set the lathe levers and/or gears...

    First you must set the lathe levers and/or gears to cut the pitch or threads per inch. Next, set up a threading tool that is exactly 60 degrees included angle, zero top rake, perpendicular to the...
  8. I hold my thumb on the rim of the carriage...

    I hold my thumb on the rim of the carriage handwheel to provide resistance, this ensures that the leadscrew is pulling the carriage along steadily and the carriage isn't 'floating'. Hope this...
  9. Replies
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    2,426

    Bevel Gears

    Phil,
    My friend cuts Module 1mm bevel gears all the time using spur gear involute cutters from China (ebay), he goes thru the cut in one pass, no filing of the teeth and it works for his Automata...
  10. Replies
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    2,426

    Small Bevel Gears

    Try Ivan Law's book "Gears and Gear Cutting" It includes calculations, set-up, making cutters etc and is fairly simple.
    Gears and Gear Cutting: Amazon.ca: Ivan R. Law: Books
    There are 3 ways ( I...
  11. Replies
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    This link is how I made my mini lathe into a mill...

    This link is how I made my mini lathe into a mill using 1,2,3 blocks. I fastened a 1/2" plate to the crosslide so I wouldn't end up drilling and tapping the machine. Then I made the steady rest in...
  12. Replies
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    1,720

    AN/UN

    Hi txcncman, thank you for your reply. My point is that the tap drill charts all give % thread based on AN and that by using UN the tap drill size can be bigger thus alleviating a lot of problems.
  13. Replies
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    1,720

    Unified National vs. American National TDS

    Please help me out here, according to my calculations, for a 1/4-28-UNF-2B (Internal Minor Diameter) a tap drill size of .221" would give a 75% UN thread which is the equivalent of a 62% AN thread....
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    652

    Craftex Lathe Coverted to Milling Machine

    Here are 2 pictures of how I converted my 7X8" lathe to a mill. I didn't drill any holes in the machine, instead I fastened a 1/2" thick aluminum plate directly onto the crosslide where the compound...
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    2,285

    If you could somehow plug each end of the tube...

    If you could somehow plug each end of the tube you could put some coolant inside the tube, this really helps with chatter.
  16. Replies
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    628

    Indicator Holder Suggestions

    Hi Guys, Does anyone have any suggestions for modifying the usual mag base dial indicator holder to make it more versatile. It seems I am always getting hung up and frustrated whenever I try to get...
  17. Replies
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    2,152

    This is what I did-- re the gibs, those 3 allen...

    This is what I did-- re the gibs, those 3 allen head cap screws (AHCS) and the 2 nuts in between, these are called gibs and they are a cheap and easy way to take up slack, they exist on the carriage...
  18. This is a wood lathe? If so I suggest re-posting...

    This is a wood lathe? If so I suggest re-posting your questions in the Woodworking Machines -- Wood Lathes/Mills forum. All the best with the lathe, hope you have fun.
  19. Replies
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    Is that black thing actually screwed down onto...

    Is that black thing actually screwed down onto the compound or is it just sitting there? it looks to me to be a spacer to mount your toolpost onto the crosslide with the compound removed, for extra...
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    Isn't there a Morse Taper Bore in the spindle...

    Isn't there a Morse Taper Bore in the spindle behind the lathe chuck? You may have to buy a sleeve to reduce it to a #2 morse taper.
  21. When you say you are disengaging the leadscrew...

    When you say you are disengaging the leadscrew are you stopping the leadscrew from turning or are you disengaging the halfnuts stopping only the carriage and the leadscrew is still turning? If you...
  22. Replies
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    1,236

    That rotor is probably a casting, grab the OD,...

    That rotor is probably a casting, grab the OD, face and bore, mount on a mandrel or fixture, turn and face.
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    Flywheel

    167882
    I would turn, face and bore the part then part off part way, come out and take a small clean up cut on the back face of the part then move over and finish parting off. That way you can turn...
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    Craftex Lathe CT039 Belt Problem

    Hi Guys,
    I have a Craftex lathe CT039 and the speed change belt is so tight that it is impossible to change speeds. As a result the lever that controls the belt adjustment from tight to loose has no...
  25. Bevel Gear Cutting with Involute Spur Gear cutter

    Hello Everyone,
    I may not be in the right forum, if so could you please re-direct me. Is it possible to cut a bevel gear in the mill using standard involute spur gear cutters or are there special...
  26. Thread: Unknown object

    by basalt
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    1,101

    It looks like an example of what the tooling...

    It looks like an example of what the tooling company can do regarding cutouts, engraving etc. More of an advertisement than anything practical.
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    Internal UN Thread Minor Dia.

    The minor diameter of a UN thread at maximum material condition is--- UN BASIC MINOR DIA. = basic O.D. - (2 X .54127P) You can find all you need at my web site "UN-UNR-UNJ-THREADS" ...
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    TDS Charts

    Thank you for your response,
    My main point was that I assumed I would be getting about 75% of full thread depth when using the charts but in reality it is closer to 90% (UN). I do agree with you...
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    Tap Drill Charts are Wrong?

    Hi Guys,
    I noticed that all the Tap Drill Charts I've seen are giving the tap drill sizes as 75% of full thread depth but in the old American National which works out to 90% Unified National.
    For...
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    Craftex Lathe Controller Problem

    Hello everyone,
    I posted a while back (in general metalwork discussion) that I had fried the circuit board on my 7" X 8" Craftex lathe because stalled the machine, blew the fuse and then bypassed...
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