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Thread: Basic milling question
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4th August 2014, 05:51 PM #1
Basic milling question
Hi
Ive been using my DM 45 mill/drill . Squaring up a rough piece of 50mm square stock, about 100mm long .
Problem is I want to be within .001" tolerance . I end up with this shape pictured , it is out of square by about .003"
I've been using a 5 tooth face milling cutter and turning the piece over . Mike
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4th August 2014, 06:52 PM #2SENIOR MEMBER
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How are you holding it Mike? If in a vice, could it be lifting? If you have a square angle plate or cylindrical squares you could try clamping to them if it is a vice issue. Other than that, all I can think of is lack of rigidity in the tool holding area, or a loose gib in the table.
As a matter of interest, how are you determining the accuracy of your work?
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4th August 2014, 07:08 PM #3
square
hi
I have the stock sitting directly on the mill table , it is held in place by 1-2-3 blocks at each end , long threaded rods go thru each 123 block down each side of the stock. I also have T nuts holding each 123 block down . Its a very rigid setup .
I am measuring with a engineers square . I am making a tailstock for the HH dividing head , I want the stock to be nice and square as I am boring a hole in it for the morse taper sleeve .
When I initially placed the stock into my 4" milling vice , the stock pushed upwards a tad . I discovered my ozmestore vice wasnt clamping correctly, the rear jaw was not sitting straight , the vice had inaccuracies .I have fixed that problem .
After fixing the vice, the square stock is sitting better but it still pushes upwards as pressure is applied onto the rear jaw , not as much as before , just a tiny amount . I will use the vice for the boring process . Mike
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4th August 2014, 07:13 PM #4GOLD MEMBER
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Apart from trying to explain this in words either read a book or do a search for squaring material on the mill.
You will find it is very easy.
Make sure you use a nice piece of bright or similar,and get your self some tally yo papers or a page from a telephone book.
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4th August 2014, 07:16 PM #5GOLD MEMBER
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Not normal practice for squaring a block without the use of a vice.
You might have more luck doing it in the lathe
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4th August 2014, 07:21 PM #6I break stuff...
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What about tram of the head? As far as I know, you can't nod the head on a DM45, but that doesn't mean it's actually square to the table...
Might have to shim under the edge of block to account for it, if that's the case, or cut in the y axis.
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4th August 2014, 07:26 PM #7
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4th August 2014, 07:40 PM #8Philomath in training
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Agreed. Doing it that way will likely get your opposite sides parallel but there is nothing in that set up that will let you get one side perpendicular to an adjacent one.
Normally you would use a vice and rely on the fixed vice jaw being parallel with the spindle axis (and so square to the table). One way is to machine one face then locate that against the fixed jaw and use a dowel between the work and the moving jaw to compensate for any jaw lift (and repeat a couple of times).
Michael
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4th August 2014, 07:44 PM #9
found this
This is well explained
Cutting a Block Square
Seems like this is the correct method
Machine Shop 3 - Basic Milling Types - Squaring
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5th August 2014, 06:02 AM #10
I had this problem. It took me a while to realise that the mill head nods forwards a little and since I have no way of correcting it I made a plate from 12 mm thick aluminum that sits on the mill table and is clamped to it. I then fly cut the surface so that it must be square to the mill head. If you measure the plate thickness at the front and back you will get an idea of how much the head nods.
Using a fixed guide and clamping the work down to this plate I can now get a truly square block. I'll take some photographs of my sacrificial plate and post them here. One advantage is you won't drill or machine into the mill table.Best Regards:
BaronJ.
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5th August 2014, 12:06 PM #11
ASIAN STANDARDS
one problem I have is i dont trust the Asian tooling . I bought a new angle plate from a Aust. ebay vendor, been using it for a while and noticed something not right. After sitting it on my carbatec surface plate , it wobbles on one surface. It needs to be scraped or surface ground . Also my asian milling vice doesnt sit perfectly on the surface plate, it wobbles a tad - not much but there is a wobble there .
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5th August 2014, 12:57 PM #12
grren with envy
1990 BROTHER TC225 VMC BT30 MILL DEEP CUTS IN MEDIUM CARBON STEEL CNC - YouTube
looking at this makes one feel inadequate........... I want one of these mills
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6th August 2014, 03:44 PM #13GOLD MEMBER
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How did you go squaring your stock?
If you used the method shown in the machining write up how did you get your stock to sit against both parallels??
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6th August 2014, 03:57 PM #14
ok
Ive just done it . I used a angle plate , a good one, not the warped one Ive got . I sat the stock on 123 blocks and clamped the stock against the angle plate . It worked OK and its now as square as I will ever get it .
After sitting the squared stock in my milling vice it now sits nicely without trying to push upwards in the jaws as it is tightened down
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6th August 2014, 05:12 PM #15GOLD MEMBER
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Would think then that by your earlier comments about your vice that it could of been done in it rather than using the 123 and angle plate.
Much easier to use the vice than the other method.
How square was your stock to start with?
What method were you using when using your vice initially?
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