| ampage Tube Amps / Music Electronics |
For current discussions, please visit Music Electronics Forum. |
ampage archive
Vintage threads from the first ten years
Bobbin/wire shift
:
 9/5/2002 10:51 PM |
|
WolfeMacleod |
Bobbin/wire shift I occasionally have an interesting problem.... My wire drifts... Since I wind on a drill press, and use the handle to guide the bobbin back and forth (instead of moving the wire) I must first extend the press outwards, wrap a few tunrs by hand along the bottom flange, and then retract the press so the wire is wound against the top part of the bobbin... Then, start the wind, extend and retract the press to guide the wire... Well, sometimes the wire seems to "drift" to the left, away from the top part of the bobbin, when the press is fully retracted...so when the wire SHOULD be closest to the top, it's actually settlings somewhere towards the middle of the coil. It's like...an invisible person is pusing my drill press to the right while I wind....or pushing my tensioner to the left, either way works... I have to stop, move my press to the right, and resume... I've checked for movement of the press and tensioner...neither are moving. There is not a great distance between the tensioner and the bobbin...the wire is still coming straight up, and is not slanted as it comes off the tensioner... Any words of wisdom? Wolfe |
|---|---|
| 9/6/2002 8:11 AM |
|
| Tony@Mastertone |
Wolfe If my mind serves me correctly your drill press sits on its side, right.... your explanation had me baffled until I remembered that...presuming I'm right of course. Is the wire exit point from your tensioner EXACTLY 90 degree's to the drill press spindle and in line with the centre of your bobbin.... if its not the wire will tend to naturally find the lowest point of whatever the radius is from the tensioner to the bobbin... I also found that about 18" is a good distance to run your tensioner, any closer and the radius is too small and any larger you get a lot of whipping...as you would know. Cheers mate.. Tone |
|---|---|
| 9/6/2002 10:43 AM |
|
| Greg Simon |
That makes a lot of sense Tony. If the drill press is on its side, its probably not exactly at 90 degrees. I don't remember since its been a couple years since I saw it firsthand, but I don't think Wolfe had anything supporting the head end of the press to make sure it was 90 degrees. You should check it out Wolfe! Could be an easy solution! Greg Simon |
|---|---|
| 9/6/2002 8:06 PM |
|
| WolfeMacleod |
Tony The drill press is level. The wire extends straight up from the tensioner, to the bobbin. Now, what you said about the wire seeking the lowest point in the coil...the wire actually climbs UPHILL sometimes, to the top of the "lump" in the middle part of the coil! WOlfe |
|---|---|
| 9/7/2002 12:21 AM |
|
| Tony@Mastertone |
Wolfe Yeh that happens but having everything at 90 degree's will minimise the affects your getting.. I tried to do a little diagram using stick figure symbols but it didn't work.... so I will draw it up and send to your email... It only needs to be out a by a couple of millimeters and it will play havoc with your tracking. If you set you bobbin centrally to the tensioner turning at a low very low rpm, say 20rpm.. does the wire stay in the centre or does it track to the left or right, if ot tracks then your wire isn't perpendicular to the axis of the winder... Tone |
|---|---|
| 9/7/2002 7:17 AM |
|
| Tony@Mastertone |
Wolfe I went out to my workshop and had a play with my drill press... I extended the arm down a little to get it away from the stop and grabbed the chuck with my other hand and I could move the chuck up and down by about 1/4"... Check it out.. Tone |
|---|---|
| 9/7/2002 7:55 AM |
|
| WolfeMacleod |
Tony I got the pictures you sent. It's set up at 90 degrees as in figure one. Also, my drill press doesn't have any up and down "play" (or in this case, side to side) I might try to reproduce this effect and film it so you can download it... Wolfe |
|---|---|
| Page 1 of 2 | Next> | Last Page>> |