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Wear Resistant Tool-Steel

We run a production job where we use a round broach, to cut a delrin-plastic material. We have to hold a pretty tight sizing tolerance on the diameter of the broached bushing, and our broach tooling is in need of an upgrade. One issue that we have, is that with any angular relief of the cutting edge, we cannot sharpen a tool without reducing it's diameter. So, for maximum tool life/sizing life, it's imperative that we have a very wear-resistant material. We currently work with a local vendor who does hard-chrome, and regrinds our existing tooling, so that is a possible avenue for re-sharpening whichever steel I were to choose.

I'm considering making a tool myself, or at least doing the design and having it made by a competent local shop. I'm having a little trouble choosing an abrasion/wear resistant tool steel however.

My first inclination is A2, or for more wear-resistance, and definitely more PITA factor, using D2. But as I research wear-resistant tool steels, a few more options seem to come up. DC53, and PM60 are also a couple options. When I look up prices for M2 & M4 high-speed steels, they seem to be about 5 times more expensive than A2, D2, S7 etc...


Tags: wear Resistant Tool-Steel for Plastic broach

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Home Shop Supply

Hi Everybody. does anybody know if Bill Hardin from Home Shop Supply is still conducting business.His website shows The Bull of The Woods books for sale,im looking for volume one any help would be appreciated.
Thanks Pat


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shimming less than 0.0004"

had a job yesterday i had to recut some rail surfaces .00035" off with a twist. the casting
near as i can tell was twisted when the opposite side was machinned similar to what cold rolled steel does when machinned.
part is about 40" long (200lbs) and supported on 3 points. since i usually use .001" and .0015"
shim stock or feeler gage material i had to think about how do i shim at support points


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Razor Blade Edge Straightness

How straight is the edge on a single edge razor blade? Not the utility knife kind, the thinner ones. I'd like to build a small precision balancing device for a project of mine Thanks!


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Long reach test indicator

I'm looking to get a long reach test indicator. I'm considering the mitutoyo 513-412 model. When u have a long stem does it affect the graduations on the dial? For example if it moves .0005 is it reading .002? Can anyone help me with this?


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how to approach machining some parts

I'm relatively new to machining. I took a couple of courses at the local community college years again, but recently have gotten into it again as a hobby.

I'm trying to build a stirling engine using Jan Ridder's plans and I am stumped as to how to setup/machine some of the parts for the crankshaft. Below I've included a picture of the parts in the plan I'm having problems with. Specifically parts 2, 4, & 6:

Initially I turned things to the diameter, then parted them off at the appropriate length, but now I can't figure out the best way to hold them. Upon further reflection it occurred to me that perhaps I should turn the offets before I part them off. Overall, I'm completely stumped.


Tags: How to approach machining Some parts

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to start...

I am very interested I'm machining. But I don't know what milling machine to start out with. At school I used a grizzly g0705 round column, and I am not very fond of it. I have enough room for a Bridgeport, but my friends told me about lagun and wells index. What do you recommend. Also can you recomend some tooling for it.Thanks!

P.s. I will be cutting soft steel and a lot of aluminum.


Tags: to start...

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CNC Machining of chengchuang

our workshop is a manufacturer, producer in China specializing in the global supply of Good, high quality, low price, low cost OEM Metal parts, steel parts, precision metal parts,such as CNC Turning machining,CNC Milling machining, metal stamping parts, springs machining,mold Manufacturing,mould design and so on.

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