Gallery, Projects and General > How do I??

<scratch head> Ok so how do I align this properly???

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SPiN Racing:
Hello All

This has been bugging me for several weeks now.

Im making the peck drill as you all know.. and I had to mill a slot in the round chunk of stainless. I also drilled holes front and back to allow the shaft to slide, as well as the arbor to be threaded into it for the tailstock.

SO here is my problem.

I have a ROUND chunk of stainless. With a slot in it.

I need to drill a hole in the thing.. at a right angle to the slot, for the pivot.

SO what I did last time, if you look at the peck drill thread.. I put a shaft into the mill.. and moved it to the side to press against the side INSIDE the slot.. when I needed to re-slot it deeper.

It didnt work quite right... I was off in the bottom of the hole by 1/6 or so of an inch..... the thing was rotated a couple degrees I guess.


SO
here is a pic.


I need to go through the side of the slot.. and out the other side. And it has to be at a right angle.

Im ok on getting the depth right.. I have a edge finger wobble thing. ANd I can crank the mill the right distance to get the left right.
I can also edge find against the jaw of the vice.. so I can get the other axis correct.
Depth is simply a matter of going through it.

The problem is the rotation of the part.. it needs to be correct in the vice.

I would do something like the HEX cutter holder thing.. but then again.. how do you get the rotation of it correct?

<scratching head and frustrated as its just.. not.. quite.. there>

 :scratch:


THanks!
Scott

bogstandard:
Spin,

You have made a standard mistake, by not planning far enough ahead. Because you don't have a rotary table or a setting block like Bernd has made, you should have drilled the hole first, then put a bar thru and used your dti on the bar to get it level, then cut the slot.

But that is now in the past, lets see if we can get you back on the straight and narrow.

The only real datum you have to work to are the sides of the slot. So unless you have something that will clamp in the slot and leave a sticky out bit so you can measure it, this C-o-C (genuine UK version) will give you something to try to get you back on track.

The pic should give you a solution to try. A bit rough and ready, but I have used bits of wood at times myself to get me out of silly situations. Don't go wacking the wood in with a sledge, just put it in the vice and gently squeeze it into position until the parallel is locked where it needs to be. The angles on the wedge I have shown are for graphic pictures only, yours should be almost parallel. Once you have it all levelled up in the vice, and tightened up, a wiggle on the parallel should release it. Then measure up and drill your hole.

I hope this helps you out of your sticky situation.

Bogs

SPiN Racing:
OH OH OH Excellent!!!

ANd since I followed advice and got a set of parallels two weeks ago... I CAN DO THIS NOW!!!  YAY!!!!

and thats sooo damn simple.. and effective!

THANK YOU!

ANd yeah I thought of that after the fact.. but not far enough to figure the bar through it to go level.. that is slick.. and I will remember it!


Ahh Ok so thats the plan then for me.


Its part of the challenge.. each thing we make is like a chess match..
Ok I need it to look like this... cut here and here.. wait.... how do I hold it for each cut.. and can I even get in there with a cutter???


Thanks John
Thats a excellent trick.. and if I can take some time at dinner tomorrow (I work 3 miles away) I might come home and give it a whirl.

bogstandard:
Hope it works for you Spin.

Bogs

Divided he ad:
Good stuff John  :clap:


I seem to remember doing it very differently..... But not as precise.... So I won't confuse the issue  :)





Hope it all works out Scott. (no reason why it shouldn't!)




Ralph.


Just noticed the pic' is the slot right through? .... Two parallel bars?  Anyway..... The boggie method will probably work better!  :thumbup:

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