Search found 7200 matches

by GlennW
Tue Jan 23, 2024 9:12 am
Forum: General Discussion
Topic: Modifing Copper Sealing Washers?
Replies: 11
Views: 541

Re: Modifing Copper Sealing Washers?

Soft copper isn't very nice to machine in the first place, but an ultra sharp tool helps a lot.

I have also seen many times where using milk as a cutting fluid supposedly works very well when machining copper. You might want to clean things up really well after though!
by GlennW
Tue Jan 23, 2024 9:08 am
Forum: General Discussion
Topic: Drilling holes in brass, should I pilot hole?
Replies: 17
Views: 1034

Re: Drilling holes in brass, should I pilot hole?

Most yellow metals will "self feed" if pilot drilled.

You can reduce the rake on the cutting edge of the drill to eliminate that issue. Well worth the trouble if you are doing a number of parts or work with these alloys a lot.
by GlennW
Sat Jan 20, 2024 4:55 pm
Forum: General Discussion
Topic: Advice On Buying A Wiggler and Centre Finder 5 Piece Set.
Replies: 21
Views: 11539

Re: Advice On Buying A Wiggler and Centre Finder 5 Piece Set.

Bill Shields wrote: Sat Jan 20, 2024 3:59 pm actually...if the wiggler is not rotating, it will not make a difference where the point is relative to the center line....

the DTI will stay stationary
That makes sense!

Thanks!
by GlennW
Sat Jan 20, 2024 3:52 pm
Forum: General Discussion
Topic: Advice On Buying A Wiggler and Centre Finder 5 Piece Set.
Replies: 21
Views: 11539

Re: Advice On Buying A Wiggler and Centre Finder 5 Piece Set.

I don't see this. If the chuck is adjusted so that the wiggler does not move when the chuck is rotated (according to the DTI), it seems to me that the point of the wiggler must be on the lathe's rotational axis. I don't see that the shape of the wiggler matters in any way. If the point is not conce...
by GlennW
Fri Jan 19, 2024 6:12 pm
Forum: Lathes
Topic: Manually machining a piston ovality
Replies: 20
Views: 1069

Re: Manually machining a piston ovality

Harold_V wrote: Fri Jan 19, 2024 5:28 pmSo then, how did they create such pistons years ago?
The ones I am familiar with from the '40's were ground on the O.D to achieve the ovality and taper required. .005" ovality, and .005" taper, so fairly easy.

But them there is Honda, taking it to an extreme!
Honda Piston.jpg
Honda Piston.jpg (5.02 KiB) Viewed 421 times
by GlennW
Wed Jan 10, 2024 4:12 pm
Forum: Lathes
Topic: Tailstock Position Accuracy?
Replies: 7
Views: 51583

Re: Tailstock Position Accuracy?

DTI's don't always read the same when you turn them upside down.

It's that gravity thing again.
by GlennW
Sun Dec 17, 2023 7:58 am
Forum: Buy, Sell, Trade, Wanted, Free!
Topic: Brown & Sharpe No 5 Surface Grinder *** SOLD ***
Replies: 4
Views: 7706

Re: Brown & Sharpe No 5 Surface Grinder *** SOLD ***

Good news!

I was about to give in...
by GlennW
Sat Dec 16, 2023 9:17 am
Forum: Lathes
Topic: Tachiyagawa Lathe
Replies: 5
Views: 10891

Re: Tachiyagawa Lathe

If you could post an image of the lathe I'm sure someone could help.

There are lots of generic Taiwanese lathes out there that were marketed under various names.
by GlennW
Sun Dec 10, 2023 6:19 pm
Forum: Casting & Foundry Work
Topic: Casting a straight edge
Replies: 32
Views: 34558

Re: Casting a straight edge

Harold_V wrote: Sun Dec 10, 2023 6:12 pm Certainly not strong enough to overcome the (limited) tensile strength of grey iron, let alone ductile iron, which is generally the material used for cranks.
Forged steel with hollow journals in this application.
by GlennW
Sat Dec 09, 2023 10:00 am
Forum: Casting & Foundry Work
Topic: Casting a straight edge
Replies: 32
Views: 34558

Re: Casting a straight edge

Please do not introduce gravity as the cause, as that force is too weak. Interesting, but I never really gave it much thought! Crankshafts should always be stored in a vertical position. My understanding is that they can bow over time if in a horizontal position and not properly supported. No first...
by GlennW
Mon Dec 04, 2023 6:12 am
Forum: Casting & Foundry Work
Topic: Casting a straight edge
Replies: 32
Views: 34558

Re: Casting a straight edge

Are you going to toss it out in the yard for a couple years to "season" it?

That seems to be a subject now open to considerable debate!
by GlennW
Thu Nov 23, 2023 4:17 pm
Forum: Lathes
Topic: Newbie getting in over my head?
Replies: 135
Views: 38507

Re: Newbie getting in over my head?

hanermo wrote: Thu Nov 23, 2023 12:38 pmand the chips are brown, purple-black if I go too fast on the rpm.
Nothing wrong with purple/black chips when using carbide.