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  1. Replies
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    Thanks, I'll keep that in mind. I think I'm...

    Thanks, I'll keep that in mind. I think I'm going to have them research the materials and make the decision.

    I try to make sure they consult real sources of info (they groan every time I hand...
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    Old Bridgeport Gearbox Power Feed Rebuild

    Hello all,

    I am the lead machining mentor with a high school robotics team in the Northeast. I had a thread a year ago in the Rebuilding and Scraping forum where some excellent PM members helped...
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    That's very interesting... I don't think we...

    That's very interesting... I don't think we really have anything that was even supposed to be 6061. Speeds and feeds that were doing very well in 6061 (domestic) are breaking endmills in this stuff...
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    Your advice did the trick! We examined the...

    Your advice did the trick!

    We examined the stock (4x2x1/8" wall) box tubing and did not find a single mark that identified the alloy. Even more strange....this material wasn't donated...it was...
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    Would slowing down the spindle and upping chip...

    Would slowing down the spindle and upping chip load per tooth help?
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    Our z-axis feed is a 16 year old girl using the...

    Our z-axis feed is a 16 year old girl using the quill.....maybe she used a cheater pipe!

    I have several girls who have taken an interest in machining...they're really sharp, and careful with the...
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    Thanks for all the info guys! We will try...

    Thanks for all the info guys!

    We will try cranking the speed up. We started at 1750rpm and the noise was incredible. Could try going to 2720 (max). We'll fixture the hell out of it and push the...
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    That's funnier than you think....two weeks ago I...

    That's funnier than you think....two weeks ago I had a student running a 1/4" endmill at 2720 (top of our range) and went into a piece of 1/8" and immediately melted the piece and pushed spiral...
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    Melting Aluminum and Clogging Endmills

    We are working with 1/8" to 1/4" aluminum stock on a Bridgeport with an original Prototrak doing basic 2D patterns. We have recently run into some major issues with endmills melting the workpiece...
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    I suppose that's two ways of saying the same...

    I suppose that's two ways of saying the same thing. I think steel chips with HSS should be formed around 300-400F (no discoloration) and with carbide should be in the 500F range....a good blue. In...
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    Thanks for the replies guys....I started...

    Thanks for the replies guys....I started suspecting a few of these issues as I stared at the photograph.

    More info:
    Bridgeport J-Head
    Steel alloy is "Free bar stock"

    I see a few conflicting...
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    New to carbide....what am I messing up here?

    I recently picked up an entry level carbide face mill with TPU style inserts. I am not looking for a mirror finish with this tool, but noticed the surface finish changed for the worse mid-cut on one...
  13. Thanks again for the feedback, guys! Richard,...

    Thanks again for the feedback, guys!

    Richard, don't worry, I don't think you're being an old crab. Like you said, I'm new to this and don't have someone experienced with me...so I'm definitely...
  14. Pete F, that makes sense. I hope to check that...

    Pete F, that makes sense. I hope to check that fit tomorrow night. As I said before, the scraping on the other side was pretty evenly distributed, so I assumed it wasn't causing major changes to...
  15. Chris, Thanks for the encouraging words! I...

    Chris,

    Thanks for the encouraging words! I should probably pick up a plate, although being essentially a journeyman (I don't have my own shop) I'd have to lug it into wherever I was working. ...
  16. Yeah....but I really wanted some scrutiny of the...

    Yeah....but I really wanted some scrutiny of the details... If I'm screwing up, I want to know!
  17. ironsmith89, I was definitely curious about your...

    ironsmith89, I was definitely curious about your opinion on my progress...thanks again for your help!

    I wish I had a surface plate...this process has been extremely interesting and I've definitely...
  18. That's a good idea, I'll check. The scraping...

    That's a good idea, I'll check. The scraping performed on the sliding side was fairly evenly distributed, so I'm not expecting to see that it caused a significant change of orientation or bearing on...
  19. More scraping done.....I assume this is showing...

    More scraping done.....I assume this is showing significant improved bearing?

    http://i.imgur.com/hvoHMjj.jpg

    This is the final condition as of now....the dark lines on the edges are where the...
  20. Hey guys, sorry it's been a while....busy time of...

    Hey guys, sorry it's been a while....busy time of the year!

    So I located some Canode from American Rotary Tools Co. As far as I could tell, the usual suspects (MSC, McMaster) don't carry it.
    ...
  21. I don't feel like you are picking in the...

    I don't feel like you are picking in the slightest. I appreciate the advice on paste bluing. As a novice, I hadn't understood that when a scraper talks about "bluing" he is almost always referring...
  22. That was my first thought as I started out and...

    That was my first thought as I started out and got very little indication....if doing it wet would help. I have regular Dykem but it takes long enough to dry that I might be able to do that?

    I...
  23. I'm not familiar with their other products, so I...

    I'm not familiar with their other products, so I certainly won't defend things I don't know about!

    This particular one is made in the USA and seemed to have good reviews among folks looking for...
  24. Guys....thanks so much for the input. Its late,...

    Guys....thanks so much for the input. Its late, but I wanted to reply after my first night of scraping.

    Progress to date:

    I spent quite a bit of time fixturing the gib (using the old one) and...
  25. First Time Scraping/Gib Fitting - Advice Needed!

    I am working on some minor refurbishing of a J-head Bridgeport with an original Prototrak rig. This machine sat mostly unused and neglected for a good 10 years in a high school shop, being used...
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