Making a face plate, what steel to use?

Discs
Dia.Dia.
Tolerance		Yield
Strength
click to learn more about
HardnessMax. Hardness After
Heat Treatment		Specifications
Met
1/2" Lg.
Each
1" Lg.
Each
3" Lg.
Each
6" Lg.
Each
2"-0.003" to 0"Not RatedRockwell B70 (Medium)Rockwell C60ASTM A1087786T12$4.557786T14$6.847786T16$16.137786T18$29.28
2 1/2"-0.003" to 0"Not RatedRockwell B70 (Medium)Not Rated__7786T2115.427786T2128.067786T21321.077786T21441.27
3"-0.004" to 0"Not RatedRockwell B70 (Medium)Rockwell C60ASTM A1087786T328.187786T3413.067786T3635.097786T3869.30
3 1/2"-0.004" to 0"Not RatedRockwell B70 (Medium)Not Rated__7786T22110.777786T22216.007786T22341.847786T22481.95
4"-0.004" to 0"Not RatedRockwell B70 (Medium)Rockwell C60ASTM A1087786T5214.347786T5421.317786T5655.707786T58109.10
4 1/2"-0.005" to 0"Not RatedRockwell B70 (Medium)Not Rated__7786T23118.757786T23227.877786T23372.847786T234142.68
5"-0.005" to 0"Not RatedRockwell B70 (Medium)Rockwell C60ASTM A1087786T6221.057786T6433.057786T6694.907786T68186.63
5 1/2"-0.005" to 0"Not RatedRockwell B70 (Medium)Not Rated__7786T24127.417786T24240.737786T243106.477786T244208.57
6"-0.005" to 0"Not RatedRockwell B70 (Medium)Rockwell C60ASTM A1087786T7225.777786T7446.867786T86128.877786T78234.30
6 1/2"0" to 0.125"Not RatedRockwell B80 (Medium)Not Rated__7786T25126.307786T25247.347786T253131.49________
7"0" to 0.156"Not RatedRockwell B80 (Medium)Not Rated__7786T26131.197786T26256.157786T263155.97________
8"0" to 0.156"Not RatedRockwell B80 (Medium)Not Rated__7786T27136.447786T27265.587786T273182.18________
9"0" to 0.188"Not RatedRockwell B80 (Medium)Not Rated__7786T28143.747786T28278.727786T283218.68________
10"0" to 0.25"Not RatedRockwell B80 (Medium)Not Rated__7786T29149

www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com
 
www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com

And only twice what I paid for two of them! Glory, I'm in the wrong business.
 
n9viw said:
www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com www.mcmaster.com

And only twice what I paid for two of them! Glory, I'm in the wrong business.
Click to expand...
Yeah, I do not buy metal from McMaster but they are a very good sounding board for what is available and if I didn't have a saw and needed a large disk it would be a good resource because their disk are at least cut square with the edges and the faces.
 
n9viw said:
And to think, all this nonsense would have been obviated if I had just bought a blank iron backplate and learned to thread come hell or high water...
Click to expand...
There's no good reason, you can't learn to single point thread (on a functional lathe with lead screw). I've seen a lot of people be totally intimidated by this, who do a lot harder things. It's not that hard. It takes some seat time, to develop muscle memory, but if you can stand and chew gum at the same time, you can single point thread. If I could learn it, anyone can.

Get yourself some 1/2" PVC pipe, you know, the cheap stuff. Chuck it up and try cutting a fine thread. Say, like 28 or 32 TPI. This will slow down the process and give you time to react. Practice the timing of getting the lead screw to engage correctly. That and when to disengage the lead screw. Start out at the lowest speed and work at it until you get things right. Then as you get more comfortable, try a new piece, but use a coarser thread (at the same slow spindle RPM). Try 10 or 13 TPI. You will have to practice getting the disengagement consistent in the middle of the thread gutter. That cutter is moving a lot faster, so you need to develop the correct reflex. Work on that a bit. Once you become more comfortable, try some aluminum, like 6061, and try that. Before you know it, you'll be fairly proficient and you will wonder why on earth you were avoiding learning this skill. If you run into problems - make a post on it and people will help you.
 
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