Recent content by GTFiji

Axym, Home run! You answered my question precisely! Not the answer I wanted to hear but great info!

Thanks for the responses. I am going to try and ask my question in another way to try and better explain my issue! The diameter I am dealing with is an outside diameter. The inspection method was to take hits around the O.D. with a CMM and then the program does a best fit of all the data and...

The drawing standard is ASME Y14.5M-1994. If I use a CMM and average a "number" of points the program reports a best fit diameter as the answer. In this case, assume I take 25 hits and the CMM calculates 79.95mms. In tolerence (80.0 +/-0.15 mms)! I can then take calipers and measure a...

This question almost seems too simple to post, but here it goes. I have a diameter callout on a drawing that is preceeded by the diametrical symbol. The dimension with tolerance is 80.0 +/-0.15 mms. Is it acceptable to measure this dimension via CMM by taking a large number of hits around the...

I was looking on the Allegheny Ludlum website at the Technical Blue Sheet for 416. It lists the mechanicals for the material that was oil quenched from 1800 f and then tempered at various charted temperatures. The 900 f temper gave 170ksi tensile and 42 Rc. I am targeting 150ksi and Rc in...

I am still searching for the lowest cost/highest quality solution. My latest run consisted of 17-4ph bars machined and heat treated to H900. The results have been very good. The parts look good after electropolishing to remove the slight discoloration. The tolerences I mention are also held...

Could anyone please advise on the approximate price/lb for 1" x 1" square bar stock in the following materials? SS 17-4 ph SS 416 Steel 4340 Assume a minimum of 5,000 ft of 1" x 1" bar cut to 5" sections.

Great feedback. Are there any other grades I should be looking at for this application? (knowing cost, as always, should be minimized)

I am looking at these two materials (4140 vs 4340) for my application, as suggested by users of this forum. I have a 62" octagonal bar (1" flat to flat) heat treated to a minimum of 150k UTS. I need to machine a square bar to my shape and then heat treat. I need the bar to hold tolerences and...

Swall - would this price increase be applicable to Armaloy's "thin dense chrome"?

metengr - what would the oil quench and temper you suggest on MatWeb do to the dimensions of the part?

If I choose an AISI 4340 what heat treatment gets me to the 150ksi UTS I am looking for? I am considering switching from SS to steel for cost savings. I also now realize I may be able to get the appearance of electro polished SS and the corrosion protectionby adding a thin dense chrome...

I have an application where I currently use AL 6061-T6, machine and then apply a Type II anodize. My parts are getting dented and nicked up. Appearance is then compromised. I want to find a suitable material alternative (Aluminum) that will increase the surface hardness (reduce blemishes)...

I meant to also mention, se currenly us Stainless electro polished for cosmetic & corrosion purposes. I think Steel would be OK if I plate/coat it.

Yes, the horse is running wild in the hills right now. My finished machined bar needs to be an octagonal (1" flat to flat) with shallow (0.09" deep) slots machined in 4 of the 8 sides. The 62.5" long bar is for a fitness (gym)application. I need to be able to machine a square (or other) bar...