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1  General Category / Gear Discussions / Re: Anti-backlash gearing on: June 18, 2018, 10:33:52 AM
Thanks Art for the info but on that last sentence:
"though Id just make the slot for the encoder shaft elongated
and adjust the encoder closer till its a tight fit myself."

So the tooth peak never hits the tooth root which means you can
adjust the mesh to where it is somewhat tight? Do I have that correct?
2  General Category / Gear Discussions / Anti-backlash gearing on: June 18, 2018, 09:39:09 AM
I did a search here on the subject of anti-backlash gearing and came up empty.
So I am asking the question about anti-backlash gearing and don't think there is any info in the gearotic software about this or specifics
in the way to implement them.
I see where springs are added to make one gear take up any backlash against a fixed gear. I know that depending on the size and strength
of the spring will limit the amount of torque that can be applied while the backlash is taken up.
In the applicati on I am thinking of all I want to do is transmit this rotary motion to an encoder so there isn't much force needed to make
sure the gear teeth stay engaged without backlash.
Just need to figure out the geometry of adding the spring(s) to at least 1 set of gears (spur) while the pinion at same size is without any
anti-backlash mechanism s.
Just wanted to run this by the forum for suggestio ns and comments.
Is this something that could be added to Gearotic?
TNX,
Bruce
3  General Category / Gear Discussions / Re: Cutter labeling on: December 06, 2017, 09:41:37 AM
Turns out the chart you show is the opposite to what the cutters actually are, so the chart the seller showed is correct
and I verified by looking at the number 1 and 8 cutters and could see which one was the 135 to rack easily.

I cut some gears a couple of days ago and they look good and very happy with results.

Still having some issues with gearotic between tools and project tabs. I need to watch the tutorial again.
4  General Category / Gear Discussions / Re: Splines on: December 03, 2017, 09:31:38 AM
Several months ago I needed to make an internal spline to mate with the spline on the output shaft of an RC servo.
I was able to find info on this particula r servo spline that gave me the root diameter so I was able to get some idea as to tooth depth.
From there I ground a HS lathe bit into a profile that fit into the spline OK, the teeth were more triangula r than gear tooth shaped
and using a fly cutter and dividing head I cut the spline into a piece of steel. I used this as a broach to cut the internal spline into
some aluminum, was a blind hole so had to make sure the blank hole was deep enough to take up the swarf from broaching .
It all worked OK and for the second time doing this I made some fixturing to hold everythin g in line while using the arbor press to push home the broach.
Since then I have bought some oil hardening tool steel so the next broach I make I can easily harden.
Any who that's my spline story.
73's
Bruce
5  General Category / Gear Discussions / Re: Cutter labeling on: December 03, 2017, 09:14:09 AM
Before I had posted this topic here I had sent a message to the seller of these cutters about the labeling.
They replied back after you responded with that list of numbers versus number of teeth and dumb a** me
I should have scrolled down on the listing farther and there was a chart showing cutter number versus range of number of teeth, however;
they show exact opposite, number 1 cutter 12-13 teeth and the list you gave me shows number 1 cutter 135 teeth to rack.
So looks like to confirm all this I will have to look at the cutter profile and determine which cutter has the straighte st profile.
I have another set (M1.0) that shows number of teeth range etched on the cutter it will cut so I can use that as a profile example to compare
with just in case I get confused (which happens often at my age) along the way.
Thanks for the help with this issue.
73's
Bruce
6  General Category / Gear Discussions / Re: Cutter labeling on: December 02, 2017, 06:38:57 PM
TNX the info Art.
I got these cutters on eBay from a seller in Ukraine. I bought 2 sets , a M0.3 (wow tiny gears!) and M0.5
and one set is etched U.S.S.R. They look OK and as far as I can tell never been used.
7  General Category / Gear Discussions / Cutter labeling on: December 02, 2017, 05:00:56 PM
I just recently purchased another set of gear cutters (M0.5) and I have a question about how they are etched-labeled.

Usually I see etched on the side of the cutter not only the Modulus of the cutter (M0.5 in this example) but along
with that a range of teeth the cutter will cut.
This new set i got has an "N" number and each cutter goes from N1 to N8 so I am guessing that correspon ds to the
range of number of teeth for each number.
Can anyone here provide me a chart that shows each N number and the range of cut teeth the cutter can make?
Thank you,
Bruce
8  General Category / Gear Discussions / Re: OD calculation on: November 15, 2017, 12:18:11 PM
Art,
I have another question about Gearotic on Projects window. Should I create a different subject? Not sure so will
ask here anyway.
Using the Tools tab I am able to see 2 gears (pinion & wheel) that are meshed together and when I send each
to the Project window the gears end up on a common shaft. How do I keep the gears on separate shafts like I see
on the Tools window?
I haven't been able to see on the Projects tab window under propertie s a button to do this separatio n.
Thanks,
Bruce
9  General Category / Gear Discussions / Re: OD calculation on: November 12, 2017, 11:37:54 AM
I would use the tangentia lly method for larger gear tooth sizes that are higher Mod numbers where
a shaped cutter might be too expensive to buy.
10  General Category / Gear Discussions / Re: OD calculation on: November 12, 2017, 11:20:40 AM
I used a shaped cutter, the mod 1's set I purchased a year ago. I used a G0704 mill converted to CNC with Flashcut
hardware and software. The g-code generated by Gearotic worked with out making any changes. Sometimes
Flashcut doesn't like the way some g-code commands are setup but not in this case.
The gears shown seem to mesh ok but I really need to either cut some thin slices off each to make a set that i
can put shafts in and see how well they do run by hand or cut up some brass blanks and make them over again
now that I have proven out the g-code.

The gear teeth are a bit coarse and I am wondering if there is/are DP or Mod's that are used more so than others?
I guess that depends on the applicati on but just curious for now.
Bruce
11  General Category / Gear Discussions / Re: OD calculation on: November 11, 2017, 07:33:31 PM


Not sure this picture of the 2 gears i made using the 4th axis. I used aluminum since i didn't have the right brass stock.
I need to go over the parameter s for the g-code generatio n since i was cutting more air than material.
12  General Category / Gear Discussions / Re: OD calculation on: November 08, 2017, 07:06:38 PM
Art,
I was successfu l in creating the G-code for 4th Axis but I find the 4th axis setup a bit confusing since
I am not familiar with some of the terminolo gy you use there. It seems more for using an end mill but I chose
a formed cutter and then slitting saw but even that shows an end mill for some odd reason in the descripti on
but the graphics show a saw. I used a value of 0.1 inches for flute length which is more cutter thickness
for a slitting saw. There are other parameter s in that window that seem more for end mills than slitting saws or formed cutters like
I am using. Oh and one other thing I am going to make my gears 1/8 inch thick but defaults 1/4 inch, how do I change that?
I updated gearotic to 3.03 to make sure I had the latest for 4th axis use.
TNX,
Bruce
13  General Category / Newest Rev Release / Best way to update/grade to newest version on: November 08, 2017, 12:54:59 PM
So what is the best and no headache way to replace an older version to a newer version?
14  General Category / Gear Discussions / Re: OD calculation on: November 08, 2017, 11:07:54 AM
Thanks Art, that clears things up on that calculati on.
So I am running Gearotic and have circular gears selected and it is displayin g a pinion and wheel. I changed the DP to 25.4
and module is showing 1 now.
My next question relates to number of teeth and cutter # (1 thru Cool for this Module 1 set of cutters. I changed the pinion
to 10 teeth and the wheel to 30 teeth but cutter number 8 shows 12 to 13 teeth, there is no cutter for 10 teeth unless I make my own
but didn't want to do that right now. So I am limited to make the pinion to 12 teeth or more because of the available cutter number?

I see under the tools tab a print button, will that print out all the gear parameter s for the pinion and wheel only? If I want to create
the G-code I would click on the 4th axis button to generate the code  using the A axis with a rotary head?

Sorry for the DA questions but I have never made a gear before ( your software did help me make a sprocket a couple of years ago.) and
this is something I have wanted to do for a long time now.
Oh and I see one could spend a fortune on cutters given there are 8 for every DP or Module!
TNX,
Bruce W7BCW
15  General Category / Gear Discussions / OD calculation on: November 07, 2017, 08:45:16 PM
I see to calculate the OD gear blank one uses the formula OD = (number of teeth + 2) / DP so far so good but
I have some gear cutters labeled M1 and I read that is the reciproca l of DP, is this correct?
They also talk about this being metric but I am confused on how to use the OD formula using M1 ( or other M #'s)
in this calculati on. Could someone please enlighten me about this differenc e between M's and DP?
Thanks,
Bruce
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