Lead Screw issue
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  1. #1
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    Default Lead Screw issue

    Hello: I am very much a newbie when it comes to machining. I have a 9C south bend lathe and a 60s era bigger lathe. Iím slowly getting better using the lathe.

    I am now trying to get an older mill working. The machine itself seems to work fairly decent. However, the lead screw and nut for the side to side movement is stripped out. It is also is missing the spacer piece(jib maybe), for one side of the bed. The lead screw is metric. I believe it is a 3 acme thread.

    Does anyone have any recommendations on how to get a new screw and nut and where to get the spacer piece.

    Another thought we have, since we are only going to be doing small pieces, is to get a compound vice and mount it to the bed and not use the controls for the bed.

    54473e7d-e5cb-44b3-8f30-4534601633a0.jpg699b4dc5-b976-4c5d-a1cb-8c806a8a9de9.jpg0ceca875-9d12-4a34-a795-5e3791a6d0da.jpg

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    What is the brand of the mill? Model and year too.

    Compound vices are just next level garbage in general.

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    I remake lead/feed screws, if you canít find a replacement let me know and I can probably help you out. But as stated above to even begin to look for a replacement we need more information on the mill.

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    there is no such thing as a 3mm acme thread

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    Quote Originally Posted by janvanruth View Post
    there is no such thing as a 3mm acme thread
    That could be why I had a hard time finding the nut. Lol

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    I will post a couple pics tomorrow. It is an older machine. I havenít been able to find it online, but I donít have the model number at home. I do know that it is a Drillmaster and the speed change control looks similar to an enco that I have seen.

    Chris

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    A bit of a clue for us all would be what graduations there are on the handwheel (ie what one full turn would be) and how many starts there are. That would help to find the correct pitch/lead. Also is it left or right hand. I just got a 2 foot length of 3/4" x 10 tpi left hand acme threaded bar from Roton to make a new cross feed shaft and bronze nut for a friends Kerry. Roton might be a good start to save you having to make the screw yourself. You may be lucky enough to find a tap. I wasn't and had to screwcut it, which was no problem once the tool was made

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    Quote Originally Posted by macchi7 View Post
    A bit of a clue for us all would be what graduations there are on the handwheel (ie what one full turn would be) and how many starts there are. That would help to find the correct pitch/lead. Also is it left or right hand. I just got a 2 foot length of 3/4" x 10 tpi left hand acme threaded bar from Roton to make a new cross feed shaft and bronze nut for a friends Kerry. Roton might be a good start to save you having to make the screw yourself. You may be lucky enough to find a tap. I wasn't and had to screwcut it, which was no problem once the tool was made
    Honestly if he needs to make the screw himself and itís a nonstandard dia/pitch, if possible Iíd just use a standard dia/pitch thread that matches the original pitch. Say for example if itís something like 7/8-8 LH, itíd be easier to use 3/4-8 LH provided everything would fit appropriately.

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    I'm with you on that one!

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    Here is a pic of the mill. There are no model numbers anywhere.
    Attached Thumbnails Attached Thumbnails 285f0130-f041-496c-9794-3fa7783f35b2.jpg  

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    Quote Originally Posted by grover99 View Post
    Here is a pic of the mill. There are no model numbers anywhere.
    Looks like a drill press to me, Clausing brand/copy

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    eb57a004-803c-4812-a9c7-22c17ae6053a.jpg
    Quote Originally Posted by digger doug View Post
    Looks like a drill press to me, Clausing brand/copy
    Here is a couple of other pics. I think it is mill, but have been wrong before.

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    Almost looks like someone married a Clausing drill head to a mill/drill base. If so, the drill head is not suitable for use as a milling machine.

    Tom

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    Quote Originally Posted by TDegenhart View Post
    Almost looks like someone married a Clausing drill head to a mill/drill base. If so, the drill head is not suitable for use as a milling machine.

    Tom
    Tom: Since I donít know much, how would I tell if this is a mill or drill press? It doesnít seem to be a marriage of 2 different machines, but I donít know for sure.
    Attached Thumbnails Attached Thumbnails 939ce279-a9f5-4c0b-a4fd-08db7c56e831.jpg  

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    Whatís the taper in the spindle? Is there an easy way to quickly remove a tool from the spindle? Are there collets?

    If itís a Morse taper without a drawbar then you can be pretty sure it isnít for milling. But really the vertical column looks to me like a drill press.

    Quote Originally Posted by grover99 View Post
    Tom: Since I donít know much, how would I tell if this is a mill or drill press? It doesnít seem to be a marriage of 2 different machines, but I donít know for sure.

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    Quote Originally Posted by naru View Post
    What’s the taper in the spindle? Is there an easy way to quickly remove a tool from the spindle? Are there collets?

    If it’s a Morse taper without a drawbar then you can be pretty sure it isn’t for milling. But really the vertical column looks to me like a drill press.
    It takes R8 collets.

    Chris

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    ..and now we know where the Rong-Fu line of machines were copied from....

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    Quote Originally Posted by janvanruth View Post
    there is no such thing as a 3mm acme thread
    US leadscrews are often eight threads per inch, which would be 3.175 mm pitch, close enough to 3mm to be confusing.

    I'd measure the leadscrew pitch by counting turns over its whole measured length, and doing the math. Or, use a thread guage, if available.

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