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Mach Discussion => General Mach Discussion => Topic started by: racear2865 on September 18, 2010, 09:24:33 PM

Title: how to bore 90 degrees
Post by: racear2865 on September 18, 2010, 09:24:33 PM
I want to install a 90 degree boring head and bore small increments and use a plugin  like the bore hole vertically plugin. any suggestions
racear
Title: Re: how to bore 90 degrees
Post by: BR549 on September 19, 2010, 12:14:13 PM
OK you lost me(;-)

90deg boring head ??  Do you mean a standard boring head with a bit that is 90 deg to the shank??

Bore hole vertical plugin??   I don't recall ever seeing that anywhere.

DO you have a picture of the setup?

IF you mean you want to use a boring head to bore vertical holes then I can help. It is done in Gcode

(;-) TP
Title: Re: how to bore 90 degrees
Post by: Hood on September 19, 2010, 12:22:17 PM
Terry I presume he is meaning a right angle attachment such as can clamp to the quill of a Bridgeport for boring horizontally.
Still not sure what he is asking though regards a plugin unless he is meaning the wizards?
Hood
Title: Re: how to bore 90 degrees
Post by: racear2865 on September 19, 2010, 01:07:57 PM
Hood
You are correct. I want to install a 90 degree attachment and try to use a wizard (not a plugin) like the one that is on Mach wizards except I want to do vertically
racear
Title: Re: how to bore 90 degrees
Post by: BR549 on September 19, 2010, 01:31:33 PM
OK do you want to DRILL/BORE a hole or cut a circle with a mill bit.

IF drill/ bore you can use the canned cycles and switch planes G18/G19

IF cut a circle I don't think the wizzards can do code for other than the standard G17 (XY) plane.

BUT you may be able to get the Gcode position values from the wizzard and switch axis in the code then use the correct PLANE.

There is always a way just depends on how bad you want to do it(;-) LOL


(;-) TP
Title: Re: how to bore 90 degrees
Post by: racear2865 on September 19, 2010, 10:07:31 PM
hey BR549
What I want to attempt  is increase and existing hole by approximately .005. I really dont know if I can control the size close enough with a end mill or if I will have to bore. Hole is in cast iron. Working on an automobile block
thanks
Title: Re: how to bore 90 degrees
Post by: BR549 on September 19, 2010, 11:57:44 PM
I think you will need to BORE the hole for accuracy .

SO you need to determene how you are going to mount the part compared to the axis. Will you be inline to the X axis or Y axis with the boring bar. That will set your Plane as either XZ or YZ. Next figure out if you are in the Positve side or neg side of the plane, left or right of zero.

Then you would get every thing set and select G18 0r G19 plane    then center the hole and use a boring canned cycle just like you would do in a vertical mode.

NOW the canned cycle is only good in the POSITVE side of the plane SO IF you find yourself on the NEG side you need to invert the axis by changing the scale from +1.000 to -1.000. 

It is just a little strange using different axis in the canned cycle call NAD if you invert teh axis the depth call will be backwards

Sample   G81 Z0.000 Y0.000 X1.000 R0.000 F3      THE ZY is the hole position and the X will be the depth.

It would go to Y0Z0 and X0.000 then slow feed down into the hole to depth then retract back to X0.000

Hope that helps, Let me know if you need more info.

(;-) TP

Title: Re: how to bore 90 degrees
Post by: racear2865 on September 20, 2010, 09:46:56 AM
First let me thank those that have helped
BR549- What I am trying to do is rebore the main holes in a automobile block. I need to do it with a 90 degres boring head to get down inside the block. I only have 4 inches to work with. I am trying to locate a right angle head that will get in that 4 inches to bore. I agrees with you, I will have to bore to insure accuracy. Man I did not know how expenxive 90 degree heads are. I am trying to find a way to do this relatively inexpensive. I know it will not be cheap but I need to watch the cost as being retired has taken its toll. I may have to take you up on your help as Friday the Delta 40 controller hit a hick up and Autocon wanted $825 for a card and that had no guarantee that it would repair the problem. So now I must plan to build a new controller. If any one has a 90 attcachment to sale , please contact me a lets see if we can gee haw. Oh by the way BR549 did your help include an air line ticket HeHeHe
Again thanks to you all
racear
Title: Re: how to bore 90 degrees
Post by: docltf on September 20, 2010, 10:31:58 AM
racear

you can do what you want.forget buying a boring head,you have to build to match your machine.if you dont
have a way to line hone forget the whole project.when you cut caps and bore it need to be .0015 small then
hone to finish.you have to be able to hone to keep from spitting the bearing out.

bill
Title: Re: how to bore 90 degrees
Post by: BR549 on September 20, 2010, 11:31:37 AM
IF you are trying to rebore the main bearing bores you need to build a reamer/boring bar to do it in the block with the rest of the mains to hold it straight. It can be cut by hand power if needed.


Basically a long shaft to extend the length of the mains. Then cut in a cutter bit slot to hold a bit. We cut VW cases like that for years. You can do the cam bores the same way.

I would HATE to try and align the machine to a set of main bores as they ALL have to be exact and inline as a SET it woul dbe VERY hard to do them one at a time and still have perfect alignment.


Just a thought, (;-) TP
Title: Re: how to bore 90 degrees
Post by: racear2865 on September 20, 2010, 03:07:52 PM
Ok, now you all are scaring me to death about not being able to bore to size. At present I do bore with a single bar with cutters mounted in 5 pockets. I have the depth set on each cutter so I hold under .0005. I have had all my blocks lined hone after line bore. when I finally started checking what comes off line hone, I found that .0005 was the best I found. What was off more than anything was alignment. If one hole start to get large you loosen the main cap until it falls in spec then retighten the cap. During this entire time, the hone will continue to hone on the bottom. Therefore as a result, I want to try on a CNC machine to see if I can bore just as well. Heck if It doesnt work, AINT no worse off. Now are all you smart people telling me that we cant do this. HeHeHe
racear
Title: Re: how to bore 90 degrees
Post by: BR549 on September 20, 2010, 04:59:01 PM
Nope not at all, Anything is possible given enough time and talent(;-).

BUT mains bores must remain in perfect alignment the entire length of the block, same with cam bores and then they must align with each other AND be spaced for gear/chain spacing.

Get the bore out of alignment in any of the 4 planes and any of the 4 bores and RUT ROW.

I have never done it OR seen it done without a boring bar fixture, but that does not mean it can't be done. JUST very time extensive on setup.

Just a thought, (;-)TP

Title: Re: how to bore 90 degrees
Post by: docltf on September 20, 2010, 05:29:58 PM
racear

i allready told you it can be done.build a boring head,get a cap cutter and a line hone.
now that you know it can happen,get on with it.

bill
Title: Re: how to bore 90 degrees
Post by: racear2865 on September 21, 2010, 08:41:59 AM
Yes I agree. I want to build the boring head. I have spent much time on the internet and have as of yet found how to do that. Apparently you know how to do that. Please share with me how to build that 90 boring head. I am not afraid to ask for this help.
racear
Title: Re: how to bore 90 degrees
Post by: edvaness on September 22, 2010, 01:05:01 AM
Here's a pic of the angle head from a Rottler. First build a spindle adaptor. U need some miter gears , sprockets , chain , and bearings to suit the size of your head. Don't make it any longer than needed. Thats all I can tell you without knowing what kind of machine you have.
If it was me , I'd farm  out the engine block.

 A precise angle boring head is a time consuming project. How often will you be using it ?

Main bearing bores MUST be finish  LINE honed.

Ed V