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  1. #1
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default How much can I hang off a couple of tee slots?

    I think I found a hole in my plan for my TGP.
    The plan was to use a piece of 125x25mm 250mm long at the level of the 25mmsq tube in the picture.(the picture is the horizontal lay out, the grinder would sit 20mm lower)
    Remembering that there will be a .75kW motor about where the purple circle is, I'm worried I'd asking to much of the Tee slots in the cross slide. They're only M10 tee bolts with a 18 dia x 14mm wide head in a tee slot 5.5mm thick, so there isnt a lot of metal there.
    Should I buy a longer piece of steel and extend the plate to the other side of the cross slide in fit a clamp there?
    Am I worrying about nothing?

    Stuart
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  2. #2
    Dave J Guest

    Default

    I would place some sort of clamp at the back.

    Dave

  3. #3
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    Well I tried Dave, but I can't find any 125x25mm I'll have to think up something else. Welding a couple of 12mm pieces together doesnt really appeal but I just might have to.

    Stuart

  4. #4
    Dave J Guest

    Default

    Looking at again and re reading it, if the plate is flat down on the cross slide it will be fine.
    Being like that takes the pivot point back to the front edge of the cross slide, so you would need a massive weight on it to pull those T nuts out.

    You might also be able to make a plate and bolt to go down the center where the compound swivels, with a decent bolt there it will be extra security.

    Dave

  5. #5
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
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    1,010

    Default

    HI,
    As Dave said ' I would place some sort of clamp at the back' of the Cross Slide. You probably won't get a G Clamp in there, but what about making one up out of some flat Bar. I am a bit confused by 'TGP' is this a Tool Post Grinder TPG ?. I take it the Blue circle is where the Motor will be Mounted ? can't You move the Motor in closer ?.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  6. #6
    Join Date
    Sep 2008
    Location
    lillimur
    Posts
    86

    Default

    Hi Stuart,
    I have some 26mm plate.I can cut you off a bit if you like.
    John

  7. #7
    Join Date
    Apr 2013
    Location
    Karana Downs QLD
    Posts
    78

    Default

    G'day Stuart, I'm starting to feel like a serial pest!

    It looks to me as though there would be plenty of strength in the cross slide if the load was spread better with a longer T nut at the back with 2 x bolts. The front one is compression only, so it's not a problem. I have milled a few 'Special Order' T nuts without any problems.
    Beaut sketch attached.

    Daryl
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  8. #8
    Join Date
    Jul 2010
    Location
    Melbourne
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    Default

    To late Dave I think you might have scared me into it.

    Hi Stewart the motor sits on another mounting plate, it will move around a little depending on pulley and belt sizes. I should look into that some more I maybe able to leave the other plate out for starters.

    Hi John, Thanks for the offer, I currently am thinking about a new plan. If it doesnt pan out I might just take you up on your offer.

    Hi Daryl, serial pest is my job! There isnt a tee slot at the back, the two bolts at the front are in a circular tee slot so I cant make them much bigger. But I am thinking about a clamp down the back.


    The current plan is to weld a couple of pieces of 150(or maybe 100) x 15mm together overlapped as in the picture. I would have to machine the front to clear the crosssilde dial If I used 25mm anyway.

    Excuse the crappy paint job, hope it makes sense.

    Stuart
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  9. #9
    Join Date
    Sep 2011
    Location
    Ballarat
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    65
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    3,103

    Default

    Hi Stuart,
    I have some 125 x 20 that is surplus to requirements if that helps.

    Phil

  10. #10
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    5,080

    Default

    Hi Stuart,

    If the motor was more vertical, rather than horizontal... like this one.



    Not sure if that would work for your setup..

    Regards
    Ray

  11. #11
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Quote Originally Posted by Stustoys View Post
    To late Dave I think you might have scared me into it.

    Hi Stewart the motor sits on another mounting plate, it will move around a little depending on pulley and belt sizes. I should look into that some more I maybe able to leave the other plate out for starters.

    Hi John, Thanks for the offer, I currently am thinking about a new plan. If it doesnt pan out I might just take you up on your offer.

    Hi Daryl, serial pest is my job! There isnt a tee slot at the back, the two bolts at the front are in a circular tee slot so I cant make them much bigger. But I am thinking about a clamp down the back.


    The current plan is to weld a couple of pieces of 150(or maybe 100) x 15mm together overlapped as in the picture. I would have to machine the front to clear the crosssilde dial If I used 25mm anyway.

    Excuse the crappy paint job, hope it makes sense.

    Stuart
    I think I would be inclined to put the motor at the back and make the distance to the spindle a little shorter. That way the weight would be more evenly distributed.

    Regards:
    Baron.

  12. #12
    Join Date
    Apr 2013
    Location
    Karana Downs QLD
    Posts
    78

    Default

    Hi Stuart. Did you know that the sub-conscious is very good at solving problems while you sleep? That's why us old blokes have a snooze every arvo!

    It looks like you are planning for your TPG to be mounted on the cross-slide. What if you gave the compound slide mounting holes the flick for starters. then;
    Make two T slots from the box-section (could be somewhat less than 25x25 I would think) about the length of the cross-slide.
    Find 4 x good spots on the top of the cross-slide to tap 8 or 10mm holes
    Attach the two T slots to the top of the cross-slide with allen head bolts (90 deg to the bed)
    Mount the TPG to the T slots

    I also wondered why the need for scraping - why does the TPG need to be accurately mounted?

    I found that facing with the (grinding) wheel slightly off true produces a much better cut - the wheel will not be chattering trying to find 'a place' on the perimeter to cut.

    Tell me (as usual) if I'm right off beam. Regards, Daryl

  13. #13
    Join Date
    Jul 2010
    Location
    Melbourne
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    9,088

    Default

    Time for an up date.

    Thanks for the offer Phil, I think I have it sorted now.

    "You might also be able to make a plate and bolt to go down the center where the compound swivels, with a decent bolt there it will be extra security."
    Hi Dave,

    There isnt any room under the cross slide, I could get a couple of mm by changing some screws to C/sink, but I'd rather this thing could go on and off without removing the cross slide.


    Hi Ray,
    My grinder uses a Vee belt. I think they need better belt tension control or they bonuce? and its 1hp (though I doubt I would be using the full hp often)

    Hi Baron,
    I looked at turning it around but it seemed pretty limiting as to what I could grind. I'll keep it in reserve incase the current plan ends up on the rocks.

    Hi Daryl,
    I have to mount it to the cross slide its to big for the compound.
    The holes for the TPG mounting bolt are in the 15mm thick piece of steel out over the cross slide handle. A tee solt might have worked if I was still using a 25mm thick plate. I picked 25mm as I need about 12mm to clear the cross slide handle and 15mm sounded about enough for the M16 mounting bolt. Also I needed 25mm to be about to leave the tee bolts in the cross slide and not have them stick up getting in the way.

    The scraping is to get two nice flat faces so hopefully it will be pretty rigid. It was pretty beat up. I guess I could have fly cut it or run the shaper over it, would likely have been "good enough"


    Turns out the steel place closes at 4:30, I was 1 minute late yesterday so I had to wait until today.
    The new plan, will look something like this. I've decided to bolt it together rather than weld as I dont want to bend it. The "bridge" part is to clear the oil hole cover that is on the todo list.
    Started scraping the small pieces flat tonight, its a good way to keep warm! First spotting didnt look so good. I see now why I need a surface grinder.
    I'll run the shaper over the large piece tomorrow if I get the time and I have enough stroke, or I'll have to clear off the mill lol

    Stuart
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  14. #14
    Dave J Guest

    Default

    Wow there is going to be some weight on there, don't use it too often or you will be scraping the cross slide again, LOL

    Maybe a few bored holes to lighten it up would help?

    Dave

  15. #15
    Join Date
    Jul 2010
    Location
    Melbourne
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    9,088

    Default

    Hi Dave,
    I figured that any extra weight on the cross slide was a good thing to counter balance whats hanging off the front.
    Might be trying to use a shoehorn to turn a sows ear into the silk purse. Angle grinder sure is looking easier.

    We'll see I guess

    Stuart

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