x-y Table for Drill Press

[geckocycles]

X2
Most tables I have and have seen are not very perpendicular front to back. You adjust them right to left but you have to shim or take them apart and work the top and bottom of the rotational pivot which is what I do. Just lap it in the up and down axis if that all make any since.

If your just looking at a X/Y table, I bought a 8X12 from the local Busy-Bee outlet. I think Grizzly and simular have it in the states.Bills X/Y rotary table sure is nice. Im not sure what that would weigh in at though.I would imagine , the size of a X/Y table, or X/Y rotary table would really depend on the size and weight of your drill press. I think another thing I would check out, is the tram of spindle to table. If it is off, can you correct this? The X/Y table mention above was aprox 100.00 dollars. Yes the table needed to have the gibs ajusted. The back lash in the screw was a little more than I liked. But on the drill press, I serves its purpose well.

Before Id do anything, Id get the dial indicator rigged up, and do a sweep around the table, just to see if its out, and by how much? The added weight , can cause the table on some drill presses to sag. I have also seen over the yrs, that some of the drill press tables are not flat. That doesnt help acheiving accurate work either! A straight edge would tell you how flat , or not it is.

Check these things out first, or you could buy a real nice Table, either X/Y, or X/Y rotary, and still not produce the kind of work your looking for. Make sure the drill press is up to the job before purchasing any acc for it.

Paul

 

[geckocycles]

In geckocycles' last reply there was embedded an extremely important point that needs emphasizing:

Except for extremely high end equipment, all workholding devices have backlash. Therefore, any time you want any kind of accuracy with any movable clamp, you ALWAYS must approach the desired position from the same direction. And, if you religiously do this, the amount of slop in the lead screws ends up being almost irrelevant.

We must be talking different things.
In every machine shop I have worked in, the Bridgeport's all needed to have pressure relieved off the screw before tightening the table down if you want to maintain extreme accuracy. I have little experience to no in a X-Y table mounted drill press vice setup but I would think the same principles would apply. Al the Bridgeport's I have and have used were not new machines though but I learn each one's habits and work around them. I have done many parts maintaining .0002" tolerance and measured in controlled environments for medical, government and bearing manufacturing..

 

[Walt]

If your just looking at a X/Y table, I bought a 8X12 from the local Busy-Bee outlet. I think Grizzly and simular have it in the states.Bills X/Y rotary table sure is nice. Im not sure what that would weigh in at though.I would imagine , the size of a X/Y table, or X/Y rotary table would really depend on the size and weight of your drill press. I think another thing I would check out, is the tram of spindle to table. If it is off, can you correct this? The X/Y table mention above was aprox 100.00 dollars. Yes the table needed to have the gibs ajusted. The back lash in the screw was a little more than I liked. But on the drill press, I serves its purpose well.

Before Id do anything, Id get the dial indicator rigged up, and do a sweep around the table, just to see if its out, and by how much? The added weight , can cause the table on some drill presses to sag. I have also seen over the yrs, that some of the drill press tables are not flat. That doesnt help acheiving accurate work either! A straight edge would tell you how flat , or not it is.

Check these things out first, or you could buy a real nice Table, either X/Y, or X/Y rotary, and still not produce the kind of work your looking for. Make sure the drill press is up to the job before purchasing any acc for it.

Paul

Thanks for the tips, I definitely need to check my drill press table for plumbness to the quill. Do you have any links showing how this should be done? I have a dial indicator but not much experience using it. I can rig something up using the mounting rods that came with the indicator, is the job any more involved than that?

I'm not currently using the gradation marks on the feed wheels on my xy table to locate anything, so the lash doesn't really bother me. I use the table as a way to move and hold my work in place under the center of the quill, and not have to re-clamp it for each and every hole. Edit/ Or are you pointing out that the lash in the screw feeds can allow the table to wander around during the drilling process? I have found this one out the hard way while making scrap! That's one of the main reasons I like the Palmgren. The clamps look like they are accessible and offer enough lever size to hold everything in place /Edit

I sent money to Plaza Machinery for a Palmgren 8" rotary xy table. It's more tool than I need right now, but I use the drill press a lot so I don't think I'll regret it. The shipping weight was listed at 27 lbs, and my drill press table seems sturdy enough to hold that kind of weight, but I'll find out for sure soon. If the worst comes to light and it turns out that my drill press just isn't up to the job, the xy-table would still work with a better drill press, I think.

Walt

 

[george wilson]

Palmgren NEVER made real high class stuff. Sears used to sell those rotary tables re badged Craftsman. Their stuff is on about the same level as Atlas,which Sears also rebadged as Craftsman. I am not sure if they are really any better than HF. And,they charge way to much for their products.

If you can get one for $200.00,o.k.,but I'd never go $800.00.

Look at the aluminum handles,and the tiny little dials to try to read. Those were common maybe in the 1920's and 30's,but should be more like 2" in diameter,unless you are expected to read them with a magnifying glass.

The best ground surfaces on their stuff is Blanchard ground. A cheap way to grind. The dovetail,sliding surfaces are left as machined,no precision grinding. The high spots in the relatively rough sliding surfaces will wear off their peaks soon.

Hope I haven't upset anyone here,but if you want the opinion of a professional,here it is.

 

[Tom Griffin]

Agreed. I would never rely on anything like that for milling, but for locating holes in a drill press it's probably ok.

Walt:

How many of these bicycle lights are you making? If it's a good number of them and they are all the same, then you should consider as geckocycles suggested, making up some drill jigs and assembly fixtures. It won't take much more effort than a couple of the lights and then everything would be easier to make and be identical. The fixtures could even be made of wood (hardwood) which is what you seem to be set up to work with. Make up a jig to drill the holes in the end plates using drill bushings to locate the holes and toggle clamps to hold the parts in the jig, and a fixture to hold the end plates in position on the tube so you can locate the tapped holes in the tube with a drill or transfer punch. Once that is accomplished you could drill them free hand in the drill press. Believe me, life would be a lot easier with a few simple fixtures.

Tom

 

[geckocycles]

Walt
Search for "tramming an head" or sweeping it is sometimes called. I can't view this vid for the slow connection I have here at the motel in Steamboat Springs but I bet it will be nearly the same as you would do on a drill press except you will be doing the adjustment on the table. You will be able to check it anyway even though you don't have the X adjustment. You best to load the table with the same weight as you will have on it. Don't chuck an indicator in the chuck but on the spindle itself as you will have errors on the chuck clamping that you don't want. They make clamps that hold indicators on the spindle for little money.
Like I said earlier you will have to lap in the X axis after you get the Y set and try to figure out how much material to remove on X.

http://www.youtube.com/watch?v=JfANyiS8Hs4

On my way for a soak at Strawberry hot springs LOL

 

[8ntsane]

Walt

I think Geckocycles vid has the general concept. Though a drill press is not a mill, it should give you a faily good idea of whats needed. The only thing you might like to know. Is you really dont need to worry about using your drill chuck to hold your indicater rod. The chuck may have run out, and it will.
But, your sweeping the table surface, so unless your quill bearings are loose, and the drill chuck is bobbing up and down, its not going to show a differance. Also the clamping fixture for the mills spindle wont work on a drill press,s small OD spindle. The mill boys usually use that method, and sometimes I do as well. If I have a cutter in a collet, and dont want to dissturb it, I do. Other wise I just mount the indicater in the collet, quill locked, and sweep the table.

Should be able to purchase one of those elcheapo 1-inch travel indicators, and quickly find out if your table needs work, or she is good enough for the work your doing.

Good Luck
Paul

I for got to mention
Most of those import tables can be modded for a lock ,so your table isnt walking around on you. Simple to do on both axis. But thats another issue, Im not sure your having. For drilling, snug gib ajustment should do the trick.

 

[CharlieW]

You could improve the setup by doing several things but I probably would not bother. Since you are making a specific part, over and over, I would suggest making a drilling fixture that has drill guide bushings. A fixture does need to be precision made but once made, it will be fast and the hole locations will be very repeatable. The other advantage is that it is a fairly cheap way to go and much faster than cranking in positions and an X/Y table and having to contend with it's limitations. Good way to go with a drill press.

Charlie.

 

[Walt]

Palmgren NEVER made real high class stuff. Sears used to sell those rotary tables re badged Craftsman. Their stuff is on about the same level as Atlas,which Sears also rebadged as Craftsman. I am not sure if they are really any better than HF. And,they charge way to much for their products.

If you can get one for $200.00,o.k.,but I'd never go $800.00.

Look at the aluminum handles,and the tiny little dials to try to read. Those were common maybe in the 1920's and 30's,but should be more like 2" in diameter,unless you are expected to read them with a magnifying glass.

The best ground surfaces on their stuff is Blanchard ground. A cheap way to grind. The dovetail,sliding surfaces are left as machined,no precision grinding. The high spots in the relatively rough sliding surfaces will wear off their peaks soon.

Hope I haven't upset anyone here,but if you want the opinion of a professional,here it is.

Thanks George,

I already pulled the trigger on this purchase. I respect your opinion on the quality of the machining, but it's for moving parts around on the table of a drill press and is a lot better than what I'm using. Perhaps the lack of smoothness in the sliding surfaces won't be a big drawback in this application.

The question I was trying to get an answer for is, that is a good value xy-table for a drill press in the $200-$300 range. Hopefully I didn't go too far wrong.

I was never going to spend $800 on this.

Walt

 

[george wilson]

I think you are o.k. for $200.00. You could re sell it for that. I have half of one of those Palmgren tables laying around myself: The rotary table part. I machined the male dovetail off of it and have used it clamped in a chuck in the lathe for indexing degrees.