Exactly, drill chuck shanks have Jacobs taper and not reliable for side loads when milling. Don'tTapping with mill = great. Looking good. Holding endmill with chuck is a little dicey, collet is more rigid. Can't wait to see end reault.
Ok ok, collets only from now on (or I'll crop the chuck outta the pic if I use it again )Exactly, drill chuck shanks have Jacobs taper and not reliable for side loads when milling. Don't
Another thing, don't run a keyless chuck in reverse. It will get tight as a bull's arse. You'll have fun getting your chuck loosened.
Nice work, M
Agreed, I'm a huge fan of chucking reamers also, if you have them, rigid is good, keeps the runout down.Tapping with mill = great. Looking good. Holding endmill with chuck is a little dicey, collet is more rigid. Can't wait to see end reault.
I'm not a fan of the chuck but if you checked the TIR of the chuck first with a ground dowel rod you should be 'ok'.Ok ok, collets only from now on (or I'll crop the chuck outta the pic if I use it again )
Very cool!… I tap on the Bridgeport too…always square, and works great!…looking forward to seeing the finished product. JohnAfter my recent horrible experience with FX Dreamline POI shift issues I decided to build a receiver which I could clamp in a bench vise, then insert the FX barrel assembly so that I could see what's up with these liner/shroud set up's (ie. why the annoying POI shifts) independent of the rest of the FX rifle & the shooter. Anyhoo, in the meantime I figured out what the issue at the heart of the FX Dreamline accuracy is: it has no barrel. To make this gun shoot, the .177 version anyway, is as simple as throwing the stock straw/noodle/liner or whatever you call it in the trash, along with the flimsy little wagon wheels spacers & the shroud. Then, buy a real barrel & have someone machine it for you so it fits the FX receiver, problem solved!!!
I had already started machining my homemade receiver though so I thought I'd finish it up & post some progress. Caution: I am not a machinist by any standards! I am a tinkerer, go ahead & criticize my methods & machining standards all you want, I am always willing to learn!
I grabbed a piece of 6061 billet & drilled two holes all the way through with a long 1/4" drill bit from the hardware store:
View attachment 489155
Enlarged & reamed top hole for an 18" Crossman barrel that I have lying around:
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Removed some material ahead of the lower hole so the valve could fit in there;
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Used a boring bar to enlarge bottom hole to .788" to accept valve:
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Test fit el-cheapo Amazon valve. Right after I bought this I saw one in Fleabay that comes with a regulator. I may upgrade to that if this receiver turn out ok, the front parts are the same:
View attachment 489159
Plunging the transfer port, I used an end mill since I was drilling through the barrel channel, drill bit likely would've walked:
View attachment 489160
Drilled & tapped some holes for a pic rail, you know, in case we wanna scope this sucker. Machinists may scorn me for tapping with the mill: I'm lazy ok, if it's faster I'm doin' it:View attachment 489161
Scope rail holes & transfer port plug tapped:
View attachment 489162
I always consult my meticulous technical drawings before I cut:
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Time to cut the loading port:
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Little more room:
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Test fit barrel, valve & tank:
View attachment 489166
Sorry for the lengthy thread, when I have more time I'll do more work on the thing& see where it goes (cue your words of encouragement here).
Who doesn't?Very cool!… I tap on the Bridgeport too…always square, and works great!…looking forward to seeing the finished product. John
I personally don't know of anyone that would be able to machine (ream) the inside of an aluminum tube over that length to that kind of accuracy. Also, the FX 'liners' are twisted so the OD is not smooth, that would make a press fit difficult.With a metal working machine or two at your disposal, why not take that experiment a little bit further and press fit the FX barrel liner in a machined aluminum tube (with the end machined to the barrel's o-ring and receiver specs)? That would eliminate barrel liner whip and allow it to attach to the experimental receiver and also the Drreamline.
I wouldn't necessarily go for superior straitness or precision press fitting. Just a decently strait and tight enough sleeve fit that the application of sleeve adhesive would lock up both metals rigidly upon curing. I'd bet that it would be comparable to these guys putting FX liner's into these carbon sleeves, whose internal straitness are not precision ground like the outside dimension, or the gunsmith who reams out an old barrel for a new liner. Can't be any worse than the factory straw...I personally don't know of anyone that would be able to machine (ream) the inside of an aluminum tube over that length to that kind of accuracy. Also, the FX 'liners' are twisted so the OD is not smooth, that would make a press fit difficult.
Bottom line when it comes to FX Dreamline POI shifts is this: FX made the thing as cheaply as possible, worse than low end guns like Marauders. The gun does not have a barrel, it has a flimsy little tube, supported by comical little plastic discs. I've even read reports of the .177 barrels being cracked open the inside due to the tight twisting when they form the grooves. Rip the whole barrel assembly out, toss it, fit a steel barrel with at least a 5/8" OD & you'll shoot dime size groups at 50yds all day, no POI shifts.
Bingo.I personally don't know of anyone that would be able to machine (ream) the inside of an aluminum tube over that length to that kind of accuracy. Also, the FX 'liners' are twisted so the OD is not smooth, that would make a press fit difficult.
Bottom line when it comes to FX Dreamline POI shifts is this: FX made the thing as cheaply as possible, worse than low end guns like Marauders. The gun does not have a barrel, it has a flimsy little tube, supported by comical little plastic discs. I've even read reports of the .177 barrels being cracked open the inside due to the tight twisting when they form the grooves. Rip the whole barrel assembly out, toss it, fit a steel barrel with at least a 5/8" OD & you'll shoot dime size groups at 50yds all day, no POI shifts.
Yep, they figured out that if you make a quality rifle folk will have no reason to buy another. Now they make as many models as possible (more than any other manufacturer), engineered as poorly as possible, then regularly bring out a "new" version of each model (Mk1, Mk2, Mk3 blah blah). So you have a current version of a model & you realize it has flaws, but hey you can't wait to sell it in order to buy the "new improved" version. Hey as long as folk fall for it & they sell lotsa their junk rifles, good for them.Bingo.
FX peddles cheap junk for exorbitant money.
They used to make guns with real barrels.....