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Questions tagged [machining]

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3
votes
2answers
93 views

Removing a welded nut

There's a nut welded on my countershaft and I don't like that. How do I remove it while minimizing the chance of damage to the countershaft's threads, as damage would necessitate: a. welding a nut ...
2
votes
1answer
34 views

Prepping freshly machined block for building

I'm building an engine from the ground up to swap into my project car. The aluminium block has been re-lined with ductile iron sleeves so the machinist sprayed them with white grease to prevent ...
0
votes
2answers
132 views

Why facing the head block?

I have recently came across a problem. One of the rocker fingers (the one that touches the valve stems, and have cam rollers) on my diesel engine head has broken. This resulted in the pistons hitting ...
2
votes
4answers
3k views

Is there a hack to repairing a seized engine?

Last week I drove on the interstate for about 1 mile when my engine died. the oil light never came on but it was low on oil and a couple thousand miles overdue for an oil change. I had it towed to a ...
5
votes
1answer
65 views

Just the straight facts; nothing edgy

In this question I asked about tolerances for straight edges. For this I have a followup question about length. If I want to purchase a straight edge, I only want to purchase one straight edge which ...
9
votes
1answer
200 views

Machinist Straight Edge Tolerance

I want to purchase a straight edge which I can use to measure the flatness of heads & blocks and other such nifty things. My question is, what is considered a good tolerance for a straight edge? ...
5
votes
1answer
63 views

Which is longer lasting HSS-E or HSS coated wth TiN?

I'm just gonna purchase taps and dies for my most commonly used metric screws. I want them to last for as long as they can (not that they will be used so often, I just want them like that). I also ...
5
votes
3answers
30k views

Rotor replacement, one or both?

I work at an independent auto repair shop and we seem to have 2 schools of thought, first thought, Mechanic A, one rotor under spec's, the other rotor on the same axle is machinable, replace only the ...
12
votes
3answers
14k views

What size hole should be drilled for an individual tap?

The other day while doing further work on my son's Subaru, I drilled a hole in a piece of angle iron then started using my 1/4-20 tap to cut some threads in the hole. The idea was to have a threaded ...
7
votes
2answers
4k views

How are crankshaft crankpin journals ground?

In looking at this question: What is crankshaft grinding and why is it done? @Pᴀᴜʟsᴛᴇʀ2 gave an excellent answer that got me thinking. First, lets include the same picture from that answer so we're ...
16
votes
2answers
25k views

What is crankshaft grinding and why is it done?

I saw a lot of YouTube videos referring to crankshaft grinding, while watching videos about working on crankshafts. I don't understand what crankshaft grinding does. If we grind a crankshaft, then ...