steam4ian
Elder Statesman
One good turn deserves another
Posts: 2,069
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Post by steam4ian on Mar 22, 2009 20:03:08 GMT
G'day All
There is another topic regarding wavy parallels but I thoughI would start a new one so it can be found for reference if ever needed.
I use ground key stock for parallels. Running a mic over it I find it true to 0.02mm. Not tool room quality but good enough. "She'll be right" You do need to break the corners to make sure there are not any projections. The stock can be cut with my favourite tool, the angle grinder.
Because it is not thin or wavy you sometime have to pack out the jaws of the milling vice to be able to clamp a thin work piece.
Hope this helps somebody.
Regards,
Ian
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Post by mmaidnz on Mar 23, 2009 6:26:21 GMT
I use the square HSS bits used to grind your own tooling.Is that the same as key stock?I've never heard the name.
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Post by Staffordshirechina on Mar 23, 2009 9:07:56 GMT
The other old favourite for free parallel packers are dismantled ball bearing races. Knock or press out the inner race and balls from the outer in your vice and you get two sizes of circular ring packers with precision ground surfaces. Especially useful if the part to be machined needs a hole drilling right through just where ordinary packers would be.
Les
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Post by dickdastardly40 on Mar 23, 2009 9:56:41 GMT
Not sure where I heard this and not had the opportunity to try it out, however steel banding which is used to hold heavy stuff onto pallets is supposedly make flexible squashable thin parallel (ish) for thin work holding. The other old favourite for free parallel packers are dismantled ball bearing races. Knock or press out the inner race and balls from the outer in your vice and you get two sizes of circular ring packers with precision ground surfaces. Especially useful if the part to be machined needs a hole drilling right through just where ordinary packers would be. A large bearing race also makes a good surface to sweep when setting up your mill to prevent the dti nib from falllng into a table slot |
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Post by alanstepney on Mar 23, 2009 10:11:04 GMT
Key stock, or key steel is / was the standard material (and size) for making keys to fit the standards keyways.
The is a specification for it, although I dont recall what it is.
Although it is fairly accurate to size, it isnt as accurate as ground precision steel, or gauge plate.
Ground key steel will be as accurate as the grinding, and that is, as Ian said, more than accurate enough for most of us.
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Post by hudmut on Apr 4, 2009 17:30:31 GMT
well if im packing some ting up i use tappit shims out of car and bike engines there free come loads of sizes
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waggy
Statesman
Posts: 744
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Post by waggy on Apr 4, 2009 19:41:13 GMT
I have a good collection of die sections from Coventry Die Head type of tools. Mine are 5/16, 3/8 and 1/2 inch thick, 0.75", 1" and 1.125" wide. Bought them from various trade stands over a period of time. Ideal for packing and accurate to 0.0005". Cost about a pound for a set of four, priceless really!
Waggy.
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