----------------------------

#3766 Oct 10, 2001

Roland,

Are the knobs for AZ and AL calibrated for measure of minutes?

[Non-text portions of this message have been removed]

----------------------------

#3767 Oct 10, 2001

In a message dated 10/10/2001 5:07:44 PM Pacific Daylight Time,

jmarietta@... writes:

> Are the knobs for AZ and AL calibrated for measure of minutes?

>

>

No, but with a little geometry I'm sure it could be.

Roland Christen

[Non-text portions of this message have been removed]

----------------------------

#3769 Oct 11, 2001

Hi Roland,

You must not remember, but you did this calculation several months ago. I

can't find my email to prove that.

As I remember the screw was a 20 TPI or .05 inches per turn rotating on a

radius of 5.7 inches. This gives 1/2deg per turn if my math is correct.

I think the other axis is a 24 TPI which is .0416 inches per turn operating

on a radius of 4.5 deg. This gives about .53 deg per turn.

So both knobs are aprox 1/2 degs per turn.

Regards

Andy

-----Original Message-----

From: chris1011@... [mailto:chris1011@...]

Sent: Wednesday, October 10, 2001 5:13 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

In a message dated 10/10/2001 5:07:44 PM Pacific Daylight Time,

jmarietta@... writes:

> Are the knobs for AZ and AL calibrated for measure of minutes?

>

>

No, but with a little geometry I'm sure it could be.

Roland Christen

[Non-text portions of this message have been removed]

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----------------------------

#3778 Oct 12, 2001

Hi All,

Just found the thread on number of degrees per turn on the AP1200. It is

message #1737 on the ap-gto group.

Andy

chris1011@a...

Date: Mon Jan 8, 2001 1:09 pm

Subject: Re: [ap-gto] AP1200 and TPoint polar alignment

In a message dated 1/8/01 10:29:26 AM Central Standard Time, ray@g...

writes:

< I just used trial and error. On the elevation one-quarter turn (I think)

was

about 20 arc mins. If Roland posts the threading on the elevation knob and

the EW knobs you can calculate with Trig how much to turn the knobs. This

would actually be nice to know. >>

On the 1200 mount, the azimuth threads are 24 TPI at a 4.5" distance, which

comes out to .53 degrees per turn, on the altitude axis, the threads are 20

TPI at about 5.7" distance, which comes out to .5 degrees per turn. So each

axis moves at close to 1/2 degree for each full rotation of the knob.

Roland Christen

-----Original Message-----

From: chris1011@... [mailto:chris1011@...]

Sent: Wednesday, October 10, 2001 5:13 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

In a message dated 10/10/2001 5:07:44 PM Pacific Daylight Time,

jmarietta@... writes:

> Are the knobs for AZ and AL calibrated for measure of minutes?

>

>

No, but with a little geometry I'm sure it could be.

Roland Christen

[Non-text portions of this message have been removed]

To UNSUBSCRIBE, or for general information on the ap-gto list

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----------------------------

#3779 Oct 12, 2001

Andy,

Thanks a million, I for one could really use that data.

Joe

----- Original Message -----

From: "Andy Forsberg" CS-Imaging@...>

To: ap-gto@yahoogroups.com

Sent: Friday, October 12, 2001 9:34 AM

Subject: RE: [ap-gto] 1200GOTO AZ and AL knobs

> Hi All,

>

> Just found the thread on number of degrees per turn on the AP1200. It is

> message #1737 on the ap-gto group.

>

> Andy

>

> chris1011@a...

> Date: Mon Jan 8, 2001 1:09 pm

> Subject: Re: [ap-gto] AP1200 and TPoint polar alignment

>

>

> In a message dated 1/8/01 10:29:26 AM Central Standard Time, ray@g...

> writes:

>

> < I just used trial and error. On the elevation one-quarter turn (I

think)

> was

> about 20 arc mins. If Roland posts the threading on the elevation knob

and

> the EW knobs you can calculate with Trig how much to turn the knobs. This

> would actually be nice to know. >>

>

>

> On the 1200 mount, the azimuth threads are 24 TPI at a 4.5" distance,

which

> comes out to .53 degrees per turn, on the altitude axis, the threads are

20

> TPI at about 5.7" distance, which comes out to .5 degrees per turn. So

each

> axis moves at close to 1/2 degree for each full rotation of the knob.

>

> Roland Christen

>

>

>

> -----Original Message-----

> From: chris1011@... [mailto:chris1011@...]

> Sent: Wednesday, October 10, 2001 5:13 PM

> To: ap-gto@yahoogroups.com

> Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

>

>

> In a message dated 10/10/2001 5:07:44 PM Pacific Daylight Time,

> jmarietta@... writes:

>

>

> > Are the knobs for AZ and AL calibrated for measure of minutes?

> >

> >

> No, but with a little geometry I'm sure it could be.

>

> Roland Christen

>

>

>

>

> [Non-text portions of this message have been removed]

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/te

>

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

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>

>

----------------------------

#3786 Oct 13, 2001

It has been a long time since I have taken TRIG, so based on Rolands

numbers below, can anyone PLEASE tell me now I translate them to

arcseconds or minutes?

I would be very grateful.

Joe Marietta

>On the 1200 mount, the azimuth threads are 24 TPI at a 4.5"

>distance, which

>comes out to .53 degrees per turn, on the altitude axis, the threads

>are 20

>TPI at about 5.7" distance, which comes out to .5 degrees per turn.

>So each

>axis moves at close to 1/2 degree for each full rotation of the knob.

Roland Christen

----------------------------

#3787 Oct 13, 2001

Joe,

You don't need trig for this one. 1/2 degree is equal to 30 arc min or 180

arcsec. Just multiply degrees by 60 for minuets and 60 again for seconds.

To go back divide seconds by 60 to get minuets and again by 60 to get

degrees.

The rest of the calculation goes like this.

24 TPI is .0416 inches per turn.

then tan a = .0416/4.5

tan a = .0092

a = arctan .0092 (the angle whose tan is .0092)

a = .52 deg or aprox 1/2 deg per turn

The other knob is done in like manner.

hope this helps

Andy

-----Original Message-----

From: Joe Marietta [mailto:jmarietta@...]

Sent: Saturday, October 13, 2001 12:52 AM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 1200GOTO AZ and AL knobs

It has been a long time since I have taken TRIG, so based on Rolands

numbers below, can anyone PLEASE tell me now I translate them to

arcseconds or minutes?

I would be very grateful.

Joe Marietta

>On the 1200 mount, the azimuth threads are 24 TPI at a 4.5"

>distance, which

>comes out to .53 degrees per turn, on the altitude axis, the threads

>are 20

>TPI at about 5.7" distance, which comes out to .5 degrees per turn.

>So each

>axis moves at close to 1/2 degree for each full rotation of the knob.

Roland Christen

To UNSUBSCRIBE, or for general information on the ap-gto list

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----------------------------

#3789 Oct 13, 2001

Thanks Andy,

Is 1/2 degree equal to 180 arcseconds or 1800 arcseconds?

> Joe,

>

> You don't need trig for this one. 1/2 degree is equal to 30 arc min or

180 > arcsec. Just multiply degrees by 60 for minuets and 60 again for seconds.

> To go back divide seconds by 60 to get minuets and again by 60 to get

> degrees.

>

> The rest of the calculation goes like this.

> 24 TPI is .0416 inches per turn.

> then tan a = .0416/4.5

> tan a = .0092

> a = arctan .0092 (the angle whose tan is .0092)

> a = .52 deg or aprox 1/2 deg per turn

>

> The other knob is done in like manner.

> hope this helps

>

> Andy

>

> -----Original Message-----

> From: Joe Marietta [mailto:jmarietta@...]

> Sent: Saturday, October 13, 2001 12:52 AM

> To: ap-gto@yahoogroups.com

> Subject: [ap-gto] 1200GOTO AZ and AL knobs

>

>

> It has been a long time since I have taken TRIG, so based on Rolands

> numbers below, can anyone PLEASE tell me now I translate them to

> arcseconds or minutes?

>

> I would be very grateful.

>

> Joe Marietta

>

>

>

>

> >On the 1200 mount, the azimuth threads are 24 TPI at a 4.5"

> >distance, which

> >comes out to .53 degrees per turn, on the altitude axis, the threads

> >are 20

> >TPI at about 5.7" distance, which comes out to .5 degrees per turn.

> >So each

> >axis moves at close to 1/2 degree for each full rotation of the knob.

>

> Roland Christen

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/te

>

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/te

>

>

----------------------------

#3790 Oct 13, 2001

Hi Joe,

It was two in the morning Joe. 1800 arcsec is correct. The last time I

checked 30x60 = 1800 but at two in the morning you never can tell. Hope

that helps. If I'm not careful that math whiz Ron W will be all over me.

Take care

Andy

-----Original Message-----

From: Joe Marietta [mailto:jmarietta@...]

Sent: Saturday, October 13, 2001 6:21 AM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

Thanks Andy,

Is 1/2 degree equal to 180 arcseconds or 1800 arcseconds?

> Joe,

>

> You don't need trig for this one. 1/2 degree is equal to 30 arc min or

180 > arcsec. Just multiply degrees by 60 for minuets and 60 again for seconds.

> To go back divide seconds by 60 to get minuets and again by 60 to get

> degrees.

>

> The rest of the calculation goes like this.

> 24 TPI is .0416 inches per turn.

> then tan a = .0416/4.5

> tan a = .0092

> a = arctan .0092 (the angle whose tan is .0092)

> a = .52 deg or aprox 1/2 deg per turn

>

> The other knob is done in like manner.

> hope this helps

>

> Andy

>

> -----Original Message-----

> From: Joe Marietta [mailto:jmarietta@...]

> Sent: Saturday, October 13, 2001 12:52 AM

> To: ap-gto@yahoogroups.com

> Subject: [ap-gto] 1200GOTO AZ and AL knobs

>

>

> It has been a long time since I have taken TRIG, so based on Rolands

> numbers below, can anyone PLEASE tell me now I translate them to

> arcseconds or minutes?

>

> I would be very grateful.

>

> Joe Marietta

>

>

>

>

> >On the 1200 mount, the azimuth threads are 24 TPI at a 4.5"

> >distance, which

> >comes out to .53 degrees per turn, on the altitude axis, the threads

> >are 20

> >TPI at about 5.7" distance, which comes out to .5 degrees per turn.

> >So each

> >axis moves at close to 1/2 degree for each full rotation of the knob.

>

> Roland Christen

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/te

>

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/te

>

>

To UNSUBSCRIBE, or for general information on the ap-gto list

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----------------------------

#3791 Oct 13, 2001

Andy,

I was not criticizing your math, I just wanted to be sure I had it right. I

apologize if I came across as such... I am still in your debt for finding

the original Roland email... I am very grateful.

Joe

----- Original Message -----

From: "Andy Forsberg" CS-Imaging@...>

To: ap-gto@yahoogroups.com

Sent: Saturday, October 13, 2001 10:50 AM

Subject: RE: [ap-gto] 1200GOTO AZ and AL knobs

> Hi Joe,

>

> It was two in the morning Joe. 1800 arcsec is correct. The last time I

> checked 30x60 = 1800 but at two in the morning you never can tell. Hope

> that helps. If I'm not careful that math whiz Ron W will be all over me.

>

> Take care

> Andy

>

> -----Original Message-----

> From: Joe Marietta [mailto:jmarietta@...]

> Sent: Saturday, October 13, 2001 6:21 AM

> To: ap-gto@yahoogroups.com

> Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

>

>

> Thanks Andy,

> Is 1/2 degree equal to 180 arcseconds or 1800 arcseconds?

>

>

>

> > Joe,

> >

> > You don't need trig for this one. 1/2 degree is equal to 30 arc min or

> 180

> > arcsec. Just multiply degrees by 60 for minuets and 60 again for

seconds.

> > To go back divide seconds by 60 to get minuets and again by 60 to get

> > degrees.

> >

> > The rest of the calculation goes like this.

> > 24 TPI is .0416 inches per turn.

> > then tan a = .0416/4.5

> > tan a = .0092

> > a = arctan .0092 (the angle whose tan is .0092)

> > a = .52 deg or aprox 1/2 deg per turn

> >

> > The other knob is done in like manner.

> > hope this helps

> >

> > Andy

> >

> > -----Original Message-----

> > From: Joe Marietta [mailto:jmarietta@...]

> > Sent: Saturday, October 13, 2001 12:52 AM

> > To: ap-gto@yahoogroups.com

> > Subject: [ap-gto] 1200GOTO AZ and AL knobs

> >

> >

> > It has been a long time since I have taken TRIG, so based on Rolands

> > numbers below, can anyone PLEASE tell me now I translate them to

> > arcseconds or minutes?

> >

> > I would be very grateful.

> >

> > Joe Marietta

> >

> >

> >

> >

> > >On the 1200 mount, the azimuth threads are 24 TPI at a 4.5"

> > >distance, which

> > >comes out to .53 degrees per turn, on the altitude axis, the threads

> > >are 20

> > >TPI at about 5.7" distance, which comes out to .5 degrees per turn.

> > >So each

> > >axis moves at close to 1/2 degree for each full rotation of the knob.

> >

> > Roland Christen

> >

> >

> >

> > To UNSUBSCRIBE, or for general information on the ap-gto list

> > see groups.yahoo.com/group

> >

> > Your use of Yahoo! Groups is subject to

docs.yahoo.com/info/te

> >

> >

> >

> >

> > To UNSUBSCRIBE, or for general information on the ap-gto list

> > see groups.yahoo.com/group

> >

> > Your use of Yahoo! Groups is subject to

docs.yahoo.com/info/te

> >

> >

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/te

>

>

>

>

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>

>

----------------------------

#3793 Oct 13, 2001

Joe,

No no I did not take it as criticizing at all. I guess you missed my sad

attempt at early morning hummer. On the other hand I don't know if Ron W

will let me refer to him as a math whiz. I know that is a real stretch. He

can beat up on me next month in Salem, OR.

I'm glad I could help.

Take care

Andy

-----Original Message-----

From: Joe Marietta [mailto:jmarietta@...]

Sent: Saturday, October 13, 2001 11:15 AM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

Andy,

I was not criticizing your math, I just wanted to be sure I had it right. I

apologize if I came across as such... I am still in your debt for finding

the original Roland email... I am very grateful.

Joe

----- Original Message -----

From: "Andy Forsberg" CS-Imaging@...>

To: ap-gto@yahoogroups.com

Sent: Saturday, October 13, 2001 10:50 AM

Subject: RE: [ap-gto] 1200GOTO AZ and AL knobs

> Hi Joe,

>

> It was two in the morning Joe. 1800 arcsec is correct. The last time I

> checked 30x60 = 1800 but at two in the morning you never can tell. Hope

> that helps. If I'm not careful that math whiz Ron W will be all over me.

>

> Take care

> Andy

>

> -----Original Message-----

> From: Joe Marietta [mailto:jmarietta@...]

> Sent: Saturday, October 13, 2001 6:21 AM

> To: ap-gto@yahoogroups.com

> Subject: Re: [ap-gto] 1200GOTO AZ and AL knobs

>

>

> Thanks Andy,

> Is 1/2 degree equal to 180 arcseconds or 1800 arcseconds?

>

>

>

> > Joe,

> >

> > You don't need trig for this one. 1/2 degree is equal to 30 arc min or

> 180

> > arcsec. Just multiply degrees by 60 for minuets and 60 again for

seconds.

> > To go back divide seconds by 60 to get minuets and again by 60 to get

> > degrees.

> >

> > The rest of the calculation goes like this.

> > 24 TPI is .0416 inches per turn.

> > then tan a = .0416/4.5

> > tan a = .0092

> > a = arctan .0092 (the angle whose tan is .0092)

> > a = .52 deg or aprox 1/2 deg per turn

> >

> > The other knob is done in like manner.

> > hope this helps

> >

> > Andy

> >

> > -----Original Message-----

> > From: Joe Marietta [mailto:jmarietta@...]

> > Sent: Saturday, October 13, 2001 12:52 AM

> > To: ap-gto@yahoogroups.com

> > Subject: [ap-gto] 1200GOTO AZ and AL knobs

> >

> >

> > It has been a long time since I have taken TRIG, so based on Rolands

> > numbers below, can anyone PLEASE tell me now I translate them to

> > arcseconds or minutes?

> >

> > I would be very grateful.

> >

> > Joe Marietta

> >

> >

> >

> >

> > >On the 1200 mount, the azimuth threads are 24 TPI at a 4.5"

> > >distance, which

> > >comes out to .53 degrees per turn, on the altitude axis, the threads

> > >are 20

> > >TPI at about 5.7" distance, which comes out to .5 degrees per turn.

> > >So each

> > >axis moves at close to 1/2 degree for each full rotation of the knob.

> >

> > Roland Christen

> >

> >

> >

> > To UNSUBSCRIBE, or for general information on the ap-gto list

> > see groups.yahoo.com/group

> >

> > Your use of Yahoo! Groups is subject to

docs.yahoo.com/info/te

> >

> >

> >

> >

> > To UNSUBSCRIBE, or for general information on the ap-gto list

> > see groups.yahoo.com/group

> >

> > Your use of Yahoo! Groups is subject to

docs.yahoo.com/info/te

> >

> >

>

>

>

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>

>

>

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