Zoryra Forum
Grades, stock shapes, metals, and plastics.
Welded assembly that moves after we machine the pads
A steel weldment has three pads that must be coplanar. We shim it, face the pads, and on the bench the pads a…
Zoryra Forum · Lead · 3 replies · 0 views ·
Copper that smears and grabs the drill Solved
Pure copper lugs. The drill grabs, the hole is rough, and the part spins in the fixture if the clamp is light…
Zoryra Forum · Lead · 3 replies · 0 views ·
Aluminum extrusions that are twisted before you clamp them Solved
Long 6061 extrusions for a heatsink are twisted about 1 mm over a meter. The print is straight within 0.2 aft…
Zoryra Forum · Lead · 3 replies · 0 views ·
Unknown stainless that is magnetic Solved
A basket of 'stainless' rings is magnetic. The customer says 316. 316 should be basically non-magnetic. These…
Zoryra Forum · Lead · 3 replies · 0 views ·
Hard chrome on a shaft we have to mask and machine Solved
A shaft arrives with hard chrome on the bearing journals. We need to turn a groove in the middle of the chrom…
Zoryra Forum · Lead · 3 replies · 0 views ·
Nylon that will not hold a press-fit pin overnight
A nylon roller gets a steel pin pressed in. It feels tight at the press. The next day the pin turns by hand.…
Zoryra Forum · Lead · 3 replies · 0 views ·
Stock allowance on a flame-cut 4140 plate Solved
A flame-cut 4140 plate is supposed to clean up at 20 mm thick. The plate measures 21 mm in the middle and 20.…
Zoryra Forum · Lead · 3 replies · 0 views ·
7075 versus 6061 for a thin bracket with threads Solved
The print says aluminum, 7075 preferred, 6061 acceptable. The part is a thin bracket with several M4 threads.…
Zoryra Forum · Lead · 3 replies · 0 views ·
ABS plastic melting on a drill Solved
ABS blocks are drilling with a standard HSS drill and the hole closes behind the drill. The flute is packed w…
Zoryra Forum · Lead · 3 replies · 0 views ·
Cast iron dust on the ways and in the lungs Solved
A gray iron bracket job makes a black dust that sits on the ways and on the window sill. Coolant is on. Peopl…
Zoryra Forum · Lead · 3 replies · 0 views ·
Titanium chip fire on a lathe during a heavy rough
A Ti-6Al-4V roughing cut threw a bright chip and a small fire in the chip pan. We put it out with the dry ext…
Zoryra Forum · Lead · 3 replies · 0 views ·
4140 prehard versus annealed for a one-off shaft Solved
A one-off shaft can be made from 4140 annealed and then heat treated, or from prehard. We have both bars. The…
Zoryra Forum · Lead · 3 replies · 0 views ·
PEEK that leaves a burr and a size change after a wash Solved
A PEEK insulator is milled to a tight width, washed in warm water, and then measures wide. There is also a fu…
Zoryra Forum · Lead · 3 replies · 0 views ·
Brass that should be free-cutting and is tearing Solved
C360 is what we ordered. The chip is long and the finish tears on a form tool. Leaded brass usually breaks ch…
Zoryra Forum · Lead · 3 replies · 0 views ·
17-4 H900 that eats inserts on a light finish Solved
17-4 in H900, light finish pass, the insert edge is gone in a few parts. Roughing in the annealed state was f…
Zoryra Forum · Lead · 3 replies · 0 views ·
Delrin that grows after machining and fails a pin gauge the next day
A Delrin bushing bores to the pin at 4 pm and the pin will not enter at 8 am. The shop is not hotter. The par…
Zoryra Forum · Lead · 3 replies · 0 views ·
304 stainless work hardening on a drill that was fine yesterday Solved
A 8 mm drill in 304 made forty holes, then squeals and the holes go undersize. The point still looks sharp. W…
Zoryra Forum · Lead · 3 replies · 0 views ·
6061 that machines gummy from one bar and clean from the next Solved
Two bars of 6061-T6 from the same nominal spec. One makes bright chips. The other smears, loads the tool, and…
Zoryra Forum · Lead · 3 replies · 0 views ·
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