Repairing a severely damaged Jet 13 X 40 saddle, Photo Heavy

[nc5a]

This saddle was damaged by driving the gib in from the back with a hammer. Then it was taken to a welder to do the repair. But as you could guess that didn't work so the gentleman was referred to me to fix it. I almost turned him away and I didn't even have the total picture of the damage. But in the end he agreed to accept my best effort to repair the damage even if it wasn't perfect.

I was more interested in figuring out what was what in the hen house than getting great photos but I think you will get the idea. When I started mapping the saddle there wasn't a surface that I could use for a reference. The measurements were all over the place, some differences by as much as 0.017". Special tooling was needed to make the best use of the only reference surface I could use. Most measurements showed are in thousandths.

In the end the customer was very pleased and mentioned the lathe didn't work this smooth even when it was new. Enjoy the photos.

[nc5a]

Bottom of the crossfeed

Back of saddle after machining

Front of saddle after machining

[nc5a]

Bottom of crossfeed
scrapped flat before roughy up for Turcite.

Crossfeed roughed up

Türcite glued on and weighted

Turcite before finishing

Turcite machined to 0.005" from final dimension

[RB211]

Would love to know more about how you go about applying Turcite

[nc5a]

Dovetail scraping fixture

Beginning stage of saddle scraping. probably hit 15 PPI in the end

Results when you get a really bad 55 degree dovetail cutter from China. I got 3 of them.


I will try and post the problems I encountered fixing the dovetail cutters, It was a royal pain in the ass.

[Mcgyver]

Wow, I think I would have sent him off to get a new casting Who does that?

Two things I noticed and wondered about, how thick is the turcite (irrc it needs some minimum thickness) and did you not scrape it flat?

[buffdan]

Great job Ron!!!

Dan

[JustJim]

My lathe didn't come with a "gib adjusting hammer", I'll contact Grizzly this morning to see if they have them in stock. My lathe is painted green, do I need a left or right handed gib hammer?

Nice work, I'd like to learn elements of machine rebuilding but I think there's a rather steep learning curve and I keep getting bogged down in more mundane workshop projects.
Jim

[reggie_obe]

Would love to know more about how you go about applying Turcite

Message Richard King over on the forum that many here love to rag about. He's kind of an expert on rebuilding machinery.

[lakeside53]

nice work!

[DR]

I don't understand how much was damage as opposed to original condition.

Was this work done for pay or as a favor for the owner? If for pay how much would this have cost and is the lathe worth the investment?

[MrWhoopee]

Was this work done for pay or as a favor for the owner? If for pay how much would this have cost and is the lathe worth the investment?

My thoughts exactly. This repair should have cost at least half the value of the lathe.

[nc5a]

Wow, I think I would have sent him off to get a new casting Who does that?

Two things I noticed and wondered about, how thick is the turcite (irrc it needs some minimum thickness) and did you not scrape it flat?

The finish thickness of the Turcite was 0.049" and you are correct I did not scrape it. I did scrape 15PPI on the crossfeed bearing surface. A general rule of thumb is 0.060" thickness for synthetic bearing surfaces that will have oil grooves and scraped flat.

[garyhlucas]

Cost to do this?

[nc5a]

Message Richard King over on the forum that many here love to rag about. He's kind of an expert on rebuilding machinery.

Richard King called me and asked if I could fix this guy's lathe.